chore(deps): update dependency rubocop-on-rbs to v2

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
rubocop-on-rbs (changelog)	'~> 1.8' → '~> 2.0'

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Release Notes

ksss/rubocop-on-rbs (rubocop-on-rbs)

v2.0.0

Compare Source

• Support rbs v4 by @​ksss in #​145
• Drop RBS/Lint/WillSyntaxError by @​ksss in #​145

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Configuration

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♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

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[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: Gemfile.lock

Writing lockfile to /tmp/renovate/repos/github/poporonnet/mrubyc_types/Gemfile.lock
Fetching gem metadata from https://rubygems.org/...........
Resolving dependencies...

Could not find compatible versions

Because steep >= 1.10.0 depends on rbs ~> 3.9
  and rubocop-on-rbs >= 2.0.0 depends on rbs ~> 4.0,
  steep >= 1.10.0 is incompatible with rubocop-on-rbs >= 2.0.0.
So, because Gemfile depends on rubocop-on-rbs ~> 2.0
  and Gemfile depends on steep ~> 1.10,
  version solving has failed.