Update additional Go dependencies

[dbussink]

Dependabot does pick up these go.mod files but somehow fails to open PRs for them to update things that are vulnerable. So doing it manually here.

Related Issue(s)

https://github.com/vitessio/vitess/security/dependabot/314

Checklist

• "Backport to:" labels have been added if this change should be back-ported
• Tests were added or are not required
• Documentation was added or is not required

[vitess-bot]

Review Checklist

Hello reviewers! 👋 Please follow this checklist when reviewing this Pull Request.

General

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[vitess-bot]

I was unable to backport this Pull Request to the following branches: release-14.0, release-15.0.