chore(deps): update actions/cache action to v4 (#229)

Author: renovate-bot

.github/workflows/conformance.yml

@@ -34,7 +34,7 @@ jobs:
     # Check if it's already in the cache
     - name: Cache client
       id: check-for-cached-client
-      uses: actions/cache@e12d46a63a90f2fae62d114769bbf2a179198b5c # v3.3.3
+      uses: actions/cache@13aacd865c20de90d75de3b17ebe84f7a17d57d2 # v4.0.0
       with:
         path: ~/go/bin/client
         key: ${{ steps.resolve-latest-client.outputs.version }}
@@ -66,7 +66,7 @@ jobs:
     - name: Pre-fetch go dependencies and build
       run: 'go build ./...'
     - name: Fetch conformance client
-      uses: actions/cache@e12d46a63a90f2fae62d114769bbf2a179198b5c # v3.3.3
+      uses: actions/cache@13aacd865c20de90d75de3b17ebe84f7a17d57d2 # v4.0.0
       with:
         path: ~/go/bin/client
         key: ${{ needs.download-conformance-client.outputs.cache-key }}