ci(bug-fix): Fix workflow version of github-action-markdown-link-check

[rbarker-dev]

Description

This pull request updates the GitHub Actions workflow to use a different action for checking Markdown links. The new action is from a different maintainer and uses a more recent version.

Workflow update:

• Switched the Markdown link checking action in .github/workflows/flow-pull-request-checks.yaml from step-security/github-action-markdown-link-check@v1.0.18 to tcort/github-action-markdown-link-check@v1.1.2.

Related Issue(s)

Fixes #1303

[github-actions]

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[codacy-production]

Up to standards ✅

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[rwalworth]

LGTM, thanks @rbarker-dev!