chore(deps): update fluxcd/flux2 action to v2.7.3

Author: timtor-bot

.github/workflows/flux-local.yaml

@@ -14,7 +14,7 @@ jobs:
         resource: ["helmrelease", "kustomization"]
     steps:
       - name: Setup Flux CLI
-        uses: fluxcd/flux2/action@v2.6.4
+        uses: fluxcd/flux2/action@v2.7.3
       - uses: allenporter/flux-local/action/[email protected]
         id: diff
         with: