Update actions/setup-node action to v4 (#519)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/build-and-test.yml

@@ -12,7 +12,7 @@ jobs:
       MOZ_HEADLESS: 1
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/setup-node@v3
+      - uses: actions/setup-node@v4
         with:
           node-version: "15"
       - uses: pnpm/action-setup@v2.4.0
@@ -38,7 +38,7 @@ jobs:
           # Use our own token instead of the default token
           # this step persists login credentials so strongly that we couldn't get them to override
           token: ${{ secrets.PUBLISH_BOT }}
-      - uses: actions/setup-node@v3
+      - uses: actions/setup-node@v4
         with:
           node-version: "15"
       - uses: pnpm/action-setup@v2.4.0