fix(deps): update module github.com/bazelbuild/buildtools to v6

[cgrindel-self-hosted-renovate]

This PR contains the following updates:

Package	Type	Update	Change
github.com/bazelbuild/buildtools	require	major	v0.0.0-20230510134650-37bd1811516d -> v6.1.2

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This PR has been generated by Renovate Bot.

[cgrindel-self-hosted-renovate]

⚠ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: go.sum

Command failed: go get -d -t ./...
go: github.com/bazelbuild/buildtools/v6@v6.1.2: go.mod has non-.../v6 module path "github.com/bazelbuild/buildtools" (and .../v6/go.mod does not exist) at revision v6.1.2

[cgrindel]

Related to bazelbuild/buildtools#1098.

Closing as will never work.