chore(deps): update dependency bundler to v2 - abandoned

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This PR contains the following updates:

Package	Update	Change
bundler	major	'~> 1.16' -> '~> 2.0'

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Configuration

📅 Schedule: Branch creation - "every weekend" in timezone GB, Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Renovate will not automatically rebase this PR, because other commits have been found.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• If you want to rebase/retry this PR, click this checkbox. ⚠ Warning: custom changes will be lost.

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⚠ 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

/usr/local/ruby/3.0.2/lib/ruby/3.0.0/rubygems.rb:281:in `find_spec_for_exe': Could not find 'bundler' (1.16.2) required by your /tmp/renovate/github/improbable/test-summary-buildkite-plugin/Gemfile.lock. (Gem::GemNotFoundException)
To update to the latest version installed on your system, run `bundle update --bundler`.
To install the missing version, run `gem install bundler:1.16.2`
	from /usr/local/ruby/3.0.2/lib/ruby/3.0.0/rubygems.rb:300:in `activate_bin_path'
	from /usr/local/ruby/3.0.2/bin/bundle:23:in `<main>'

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Autoclosing Skipped

This PR has been flagged for autoclosing. However, it is being skipped due to the branch being already modified. Please close/delete it manually or report a bug if you think this is in error.