fuzz: Use Go 1.18 on CI and fix cache path

Signed-off-by: Paulo Gomes <[email protected]>

.github/workflows/cifuzz.yaml

@@ -13,12 +13,19 @@ jobs:
     steps:
     - name: Checkout
       uses: actions/checkout@v2
+    - name: Setup Go
+      uses: actions/setup-go@v3
+      with:
+        go-version: 1.18.x
+    - id: go-env
+      run: |
+        echo "::set-output name=go-mod-cache::$(go env GOMODCACHE)"
     - name: Restore Go cache
-      uses: actions/cache@v1
+      uses: actions/cache@v3
       with:
-        path: /home/runner/work/_temp/_github_home/go/pkg/mod
+        path: ${{ steps.go-env.outputs.go-mod-cache }}
         key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
         restore-keys: |
-          ${{ runner.os }}-go-
+          ${{ runner.os }}-go
     - name: Smoke test Fuzzers
       run: make fuzz-smoketest