chore(deps): update actions/checkout action to v4.1.3 (#76)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

.github/workflows/build-charm.yaml

@@ -20,7 +20,7 @@ jobs:
     name: Build and push charms
     runs-on: ${{ inputs.runs-on }}
     steps:
-      - uses: actions/[email protected].1
+      - uses: actions/[email protected].3
       - uses: canonical/[email protected]
       - name: Extract charm name
         working-directory: ${{ inputs.working-directory }}