Update anishathalye/proof-html action to v2

Author: renovate-bot

.github/workflows/proof-html.yml

@@ -6,6 +6,6 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: anishathalye/proof-html@v1.1.0
+      - uses: anishathalye/proof-html@v2.2.0
         with:
           directory: ./