chore(deps): Update actions/checkout action to v6 (#35)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/checkout](https://redirect.github.com/actions/checkout) |
action | major | `v5` -> `v6` |

---

### Release Notes

<details>
<summary>actions/checkout (actions/checkout)</summary>

### [`v6`](https://redirect.github.com/actions/checkout/compare/v5...v6)

[Compare
Source](https://redirect.github.com/actions/checkout/compare/v5...v6)

</details>

---

### Configuration

📅 **Schedule**: Branch creation - "before 5am on the first day of the
month" (UTC), Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you
are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

This PR was generated by [Mend Renovate](https://mend.io/renovate/).
View the [repository job
log](https://developer.mend.io/github/epage/_rust).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0Mi4xOS45IiwidXBkYXRlZEluVmVyIjoiNDIuMTkuOSIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOltdfQ==-->

Author: epage

.github/workflows/audit.yml

@@ -31,7 +31,7 @@ jobs:
     continue-on-error: true
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - uses: actions-rs/audit-check@v1
       with:
         token: ${{ secrets.GITHUB_TOKEN }}
@@ -46,7 +46,7 @@ jobs:
         checks:
           - bans licenses sources
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: EmbarkStudios/cargo-deny-action@v2
       with:
         command: check ${{ matrix.checks }}

.github/workflows/ci.yml

@@ -43,7 +43,7 @@ jobs:
       CARGO_PROFILE_DEV_DEBUG: line-tables-only
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: Install Rust
       uses: dtolnay/rust-toolchain@stable
       with:
@@ -62,7 +62,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: Install Rust
       uses: dtolnay/rust-toolchain@stable
       with:
@@ -79,7 +79,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: Install stable Rust
       uses: dtolnay/rust-toolchain@stable
       with:
@@ -96,7 +96,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: Install Rust
       uses: dtolnay/rust-toolchain@stable
       with:
@@ -109,7 +109,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: Install Rust
       uses: dtolnay/rust-toolchain@stable
       with:
@@ -124,7 +124,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: Install Rust
       uses: dtolnay/rust-toolchain@stable
       with:
@@ -140,7 +140,7 @@ jobs:
       security-events: write # to upload sarif results
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: Install Rust
       uses: dtolnay/rust-toolchain@stable
       with:
@@ -170,7 +170,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: Install Rust
       uses: dtolnay/rust-toolchain@stable
       with:

.github/workflows/committed.yml

@@ -21,7 +21,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout Actions Repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         fetch-depth: 0
     - name: Lint Commits

.github/workflows/pre-commit.yml

@@ -22,7 +22,7 @@ jobs:
       contents: read
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: actions/setup-python@v6
       with:
         python-version: '3.x'

.github/workflows/rust-next.yml

@@ -33,7 +33,7 @@ jobs:
       CARGO_PROFILE_DEV_DEBUG: line-tables-only
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: Install Rust
       uses: dtolnay/rust-toolchain@stable
       with:
@@ -54,7 +54,7 @@ jobs:
       CARGO_RESOLVER_INCOMPATIBLE_RUST_VERSIONS: allow
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: Install Rust
       uses: dtolnay/rust-toolchain@stable
       with:

.github/workflows/spelling.yml

@@ -20,6 +20,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout Actions Repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: Spell Check Repo
       uses: crate-ci/typos@master