chore(deps): update peter-evans/find-comment action to v4

Author: renovate[bot]

.github/workflows/openapi-diff.yml

@@ -34,7 +34,7 @@ jobs:
           >> $GITHUB_OUTPUT
       - name: Find existing comment
         id: find_comment
-        uses: peter-evans/find-comment@3eae4d37986fb5a8592848f6a574fdf654e61f9e # v3
+        uses: peter-evans/find-comment@b30e6a3c0ed37e7c023ccd3f1db5c6c0b0c23aad # v4
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           repository: ${{ github.repository }}