fix: use bash shell for debug step to work on Windows

The debug step was failing on Windows because it used Unix-specific
paths and syntax. Adding 'shell: bash' ensures bash is used on both
Unix and Windows (Git Bash is available on Windows runners).

Author: felixweinberger

.github/workflows/shared.yml

@@ -58,6 +58,7 @@ jobs:
 
       - name: Debug - Inspect installed anyio package
         if: matrix.dep-resolution.name == 'lowest-direct'
+        shell: bash
         run: |
           echo "=== Anyio version from venv (direct check) ==="
           .venv/bin/python -c "from importlib.metadata import version; print(version('anyio'))"