ci: use bash shell for clippy to fix Windows compatibility

PowerShell doesn't support backslash line continuation. By explicitly
using bash shell, the clippy command works on all platforms including
Windows (which has Git Bash pre-installed on GitHub Actions runners).

Fixes error on Windows:
"The term '-A' is not recognized as a name of a cmdlet..."

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: p1024k

.github/workflows/test.yml

@@ -48,6 +48,7 @@ jobs:
         continue-on-error: true  # Continue to next steps even if tests fail
 
       - name: Run clippy
+        shell: bash
         run: |
           # Allow some pre-existing warnings while keeping CI green
           # TODO: Fix these pre-existing warnings and remove the allows