gha: add cache-dependency-path to lint-golang.yml

Fixes warning:
> Restore cache failed: Dependencies file is not found in
/home/runner/work/redpanda/redpanda. Supported file pattern: go.sum

(cherry picked from commit d9867d7)

.github/workflows/lint-golang.yml

@@ -23,6 +23,7 @@ jobs:
         uses: actions/setup-go@v5
         with:
           go-version: stable
+          cache-dependency-path: src/go/rpk/go.mod
       - name: Run golangci-lint
         uses: golangci/golangci-lint-action@v6
         with: