Update reusable-zizmor workflow reference (#135)

Author: isaiah-grafana

.github/workflows/self-zizmor.yaml

@@ -45,7 +45,7 @@ jobs:
       - zizmor-check
     if: ${{ needs.zizmor-check.outputs.found-files == 'true' }}
 
-    uses: grafana/shared-workflows/.github/workflows/reusable-zizmor.yml@7767d8f1daca94ff2b103a7aa7a8e917a55f55c3
+    uses: grafana/shared-workflows/.github/workflows/reusable-zizmor.yml@4d8d8be02d0d59b047dcb2f36e1b153b4c69600a
     with:
       runs-on: ${{ !github.event.repository.private && 'ubuntu-latest' || 'ubuntu-arm64-small' }}
       fail-severity: high