Pin markdownlint-cli version to 0.45.0 in GitHub workflow

[Copilot]

This PR pins the version of markdownlint-cli used in our GitHub workflows to version 0.45.0.

The change is made to avoid potential build breaks when new versions of markdownlint-cli are released with breaking changes or different behavior. By pinning to a specific version, we ensure consistent and predictable behavior for our markdownlint checks across all PRs.

The change is minimal and only affects the npm installation command in the workflow file:

- npm i -g markdownlint-cli + npm i -g markdownlint-cli@0.45.0

Fixes #62033.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• pkgs.dev.azure.com
  • Triggering command: npm view markdownlint-cli versions (dns block)
  • Triggering command: npm search markdownlint-cli (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to my firewall allow list

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