Are hashes computed for external deps when go deps are brought in with bzlmod

[kriscfoster]

Trying to understand if bazel-diff still works for go deps brought in via the new gazelle/rules_go bzlmod mechanism - https://github.com/bazelbuild/rules_go/blob/master/docs/go/core/bzlmod.md.

Our hashes file does not include any of the external go dependencies since migrating to the new mechanism.