Bump golang.org/x/net to 0.56.0, golang.org/x/sys to 0.46.0 and golang.org/x/text to 0.39.0

[ivonaest]

Update indirect Go dependencies in go-sdk/ to address known CVEs:

• golang.org/x/net 0.55.0 → 0.56.0
• golang.org/x/sys 0.45.0 → 0.46.0
• golang.org/x/text 0.37.0 → 0.39.0

Build and all tests pass.

[jason810496]

We need to fix the go.mod in Lang-SDK k8s test as well, thanks.

  Check lang-SDK Go example module is tidy against the Go SDK..................................................Failed
  - hook id: check-go-example-mod-tidy
  - exit code: 1

    ERROR: kubernetes-tests/lang_sdk/go_example is not tidy.

    It is a separate Go module that resolves the SDK via a `replace` onto go-sdk,
    so it keeps its own copy of the SDK's indirect requirements. A dependency moved in
    go-sdk without this module being re-tidied, which breaks the
    'Kubernetes tests / K8S Lang-SDK' bundle build on every pull request once merged.

    Fix it in this PR by running:

        (cd kubernetes-tests/lang_sdk/go_example && go mod tidy)

    and committing the resulting go.mod / go.sum changes.

[jason810496]

I didn't find any security or compatibility regression, thanks.