Disable setup-go cache to avoid warnings

When cache is enabled we always get warnings from tar:

    usr/bin/tar: ../../../go/pkg/mod/golang.org/x/telemetry/config@v0.29.0/doc.go: Cannot open: File exists
    /usr/bin/tar: ../../../go/pkg/mod/golang.org/x/telemetry/config@v0.29.0/LICENSE: Cannot open: File exists
    /usr/bin/tar: ../../../go/pkg/mod/golang.org/x/telemetry/config@v0.29.0/config.json: Cannot open: File exists
    /usr/bin/tar: ../../../go/pkg/mod/golang.org/x/telemetry/config@v0.29.0/go.mod: Cannot open: File exists
    /usr/bin/tar: Exiting with failure status due to previous errors
    Warning: Failed to restore: "/usr/bin/tar" failed with error: The process '/usr/bin/tar' failed with exit code 2

According to setup-go issue[1] the mitigation is to disable the cache.

Strangely, when the cache is disabled, the setup-go step is adding go to
the cache:

    Adding to the cache ...
    Successfully cached go to /opt/hostedtoolcache/go/1.23.0/x64

[1] actions/setup-go#403

.github/workflows/ci.yaml

@@ -46,5 +46,6 @@ jobs:
         uses: actions/setup-go@v5
         with:
           go-version-file: go.mod
+          cache: false
       - name: Build binary
         run: GOOS=${{ matrix.goos }} GOARCH=${{ matrix.goarch }} go build