Update dependency liquid-c to '~> 4.2.0'

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
liquid-c (source)	'~> 4.0.1' -> '~> 4.2.0'

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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
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The artifact failure details are included below:

File name: Gemfile.lock

Fetching gem metadata from https://rubygems.org/.........
Resolving dependencies...

Could not find compatible versions

Because liquid-c >= 4.1.0 depends on liquid >= 5.0.1
  and every version of jekyll depends on liquid ~> 4.0,
  liquid-c >= 4.1.0 is incompatible with jekyll >= 0.
So, because Gemfile depends on jekyll ~> 4.3.0
  and Gemfile depends on liquid-c ~> 4.2.0,
  version solving has failed.