fix: Fix path filtering on CI

Author: amotl

.github/workflows/ci.yml

@@ -104,8 +104,6 @@ jobs:
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
-        with:
-          ref: ${{ inputs.branch || github.ref }}
       - name: Filter Paths
         id: filter
         uses: dorny/paths-filter@v3