Merge pull request #1126 from modelcontextprotocol/dependabot/github_actions/actions/attest-build-provenance-4

chore(deps): bump actions/attest-build-provenance from 3 to 4

Author: cliffhall

.github/workflows/main.yml

@@ -109,7 +109,7 @@ jobs:
           labels: ${{ steps.meta.outputs.labels }}
 
       - name: Generate artifact attestation
-        uses: actions/attest-build-provenance@v3
+        uses: actions/attest-build-provenance@v4
         with:
           subject-name: ghcr.io/${{ github.repository }}
           subject-digest: ${{ steps.push.outputs.digest }}