chore(deps): update actions/upload-artifact digest to b4b15b8

.github/workflows/policy-ci.yml

@@ -45,7 +45,7 @@ jobs:
       uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4
     - name: Build Bundle
       run: opa build -o ./bundle.tar.gz -r ${{ github.sha }} ./examples/policies
-    - uses: actions/upload-artifact@604373da6381bf24206979c74d06a550515601b9 # v4
+    - uses: actions/upload-artifact@b4b15b8c7c6ac21ea08fcf65892d2ee8f75cf882 # v4
       with:
         name: policy-bundle
         path: ./bundle.tar.gz