Address recent dependency issues

[karras]

There's been several dependency-related PRs by Dependabot which are still blocked or required follow-up actions, and must be revisited:

• Bump github.com/google/go-metrics-stackdriver from 0.2.0 to 0.6.0 openbao#981

  • https://github.com/google/go-metrics-stackdriver is archived. We never made metrics pluggable and we kept it post-split even though many of these are proprietary. Upgrading this brings in a dependency on hashicorp/go-metrics; I'm not sure if everything in our stack can be upgraded from armon/go-metrics yet but that would be a prereq for this.

• Bump github.com/hashicorp/hcl from 1.0.1-vault-5 to 1.0.1-vault-7 openbao#1105

  • This breaks tests; we'll need to revisit how we want to handle this.

• Bump gotest.tools/gotestsum from 1.10.0 to 1.12.1 openbao#1118

  • It might be good to split this into a separate tools/go.mod file as part of supply chain cleanup

• Bump github.com/ory/dockertest/v3 from 3.10.0 to 3.12.0 openbao#1197

  • This might be a good candidate for removal; it is used in two test suites.

Thanks for the inputs, @cipherboy!