chore(deps): bump actions/cache from 3 to 4 (#5801)

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.github/workflows/openhands-resolver.yml

@@ -100,7 +100,7 @@ jobs:
               contains(github.event.review.body, '@openhands-agent-exp')
             )
           )
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ${{ env.pythonLocation }}/lib/python3.12/site-packages/*
           key: ${{ runner.os }}-pip-openhands-resolver-${{ hashFiles('requirements.txt') }}