fix: exclude auto-generated files from flake8 linting

**Changes**:
- Exclude versioneer.py from flake8 checks (auto-generated by versioneer)
- Exclude src/accelerometer/_version.py (auto-generated version file)

**Rationale**:
Auto-generated files should not be linted as they are not maintained
manually and may not conform to project style guidelines. These files
are generated by the versioneer package for git-based versioning.

Author: chanshing

.github/workflows/flake8.yml

@@ -28,6 +28,8 @@ jobs:
       - name: Lint with flake8
         run: |
           # stop the build if there are Python syntax errors or undefined names
-          flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
+          flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics \
+            --exclude=versioneer.py,src/accelerometer/_version.py
           # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
-          flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+          flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics \
+            --exclude=versioneer.py,src/accelerometer/_version.py