fix(deps): update undici transitive dependency

[MikeMcC399]

Situation

npm audit and dependabot report a low severity vulnerability CVE-2025-47279 in undici:

• @actions/cache@4.0.2 uses undici@5.28.5
• markdown-link-check@3.13.7 uses undici@6.21.1

Change

npm audit fix is used to update the undici dependencies as follows:

• @actions/cache@4.0.2 updated to undici@5.29.0
• markdown-link-check@3.13.7 updated to undici@6.21.3

[cypress-app-bot]

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