fix(ci): skip zizmor on Windows runners

Author: jdalton

.github/actions/checkout/action.yml

@@ -33,6 +33,7 @@ runs:
         persist-credentials: false
 
     - name: Audit GitHub Actions
+      if: runner.os != 'Windows'
       uses: zizmorcore/zizmor-action@71321a20a9ded102f6e9ce5718a2fcec2c4f70d8 # v0.5.2
       with:
         min-severity: medium