fix(github-action): update allenporter/flux-local action to 5.3.1

Author: renovate[bot]

.github/workflows/flux-diff.yaml

@@ -32,7 +32,7 @@ jobs:
           password: "${{ steps.generate-token.outputs.token }}"
 
       - name: Diff Resources
-        uses: allenporter/flux-local/action/diff@ea8e71de9a53040c43d9cd85259846e4b896c98f # 5.3.0
+        uses: allenporter/flux-local/action/diff@a7781d853eb47a8c5b24406f1a1ebe6c2c220c73 # 5.3.1
         id: diff
         with:
           live-branch: master