test(e2e): Pin agents package in cloudflare-mcp test

[github-actions]

Note

The pull request "test(e2e): Pin agents package in cloudflare-mcp test" was created by @chargome but did not reference an issue. Therefore this issue was created for better visibility in external tools like Linear.

[linear]

JS-1356

[github-actions]

A PR closing this issue has just been released 🚀

This issue was referenced by PR #18609, which was included in the 10.33.0 release.