Exclude tests from mypy type checking in CI

Updates the release workflow to exclude the 'tests' directory when running mypy type checking, ensuring only the main source code is checked for type errors.

Author: edeno

.github/workflows/release.yml

@@ -32,7 +32,7 @@ jobs:
       - name: Run ruff linting
         run: ruff check src/track_linearization/ --output-format=github
       - name: Run mypy type checking
-        run: mypy src/track_linearization/
+        run: mypy src/track_linearization/ --exclude 'tests'
 
   test:
     name: Test Python ${{ matrix.python-version }}