Update dependency markdownlint-cli2 to ^0.12.1

This MR contains the following updates:

Package	Type	Update	Change
markdownlint-cli2	dependencies	minor	^0.11.0 -> ^0.12.1

MR created with the help of gitlab-org/frontend/renovate-gitlab-bot

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Release Notes

DavidAnson/markdownlint-cli2

v0.12.1

Compare Source

• Update JSONC parsing to handle trailing commas
• Add documentation links to JSON schema
• Update dependencies

v0.12.0

Compare Source

• Remove deprecated markdownlint-cli2-config entry point
  • Use markdownlint-cli2 --config ... instead
• Remove deprecated markdownlint-cli2-fix entry point
  • Use markdownlint-cli2 --fix ... instead
• Add --help and --no-globs parameters
• Improve and document included JSON schemas
• Update dependencies (including markdownlint)

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