Bump actions/cache from 3.3.3 to 4.0.0 (#35)

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.github/workflows/ci.yml

@@ -34,7 +34,7 @@ jobs:
           fetch-depth: 1
           path: ${{ env.GOPATH }}/src/github.com/${{ github.repository }}
       - name: Cache go modules and build cache
-        uses: actions/cache@v3.3.3
+        uses: actions/cache@v4.0.0
         with:
           # In order:
           # * Module download cache