circuitjs1: update livecheck

[adithyasunil26]

With reference to #171006 .

Updated livecheck to :page_match instead of ':extract_plist'. Please do verify my regex as I am not very experienced with writing them.

After making any changes to a cask, existing or new, verify:

• The submission is for a stable version or documented exception.
• brew audit --cask --online <cask> is error-free.
• brew style --fix <cask> reports no offenses.

[samford]

Looking at the GitHub repository, the commit to update circuitjs1.java to 2.9.0js was on 2024-02-24 but the dmg was last modified on 2024-02-26. If we check the circuitjs1.java file, livecheck will surface a new version before the dmg file is updated (this is why we try to align the check with the same source as the cask url).

If we bump the version before the falstad.com dmg is updated, then users would seemingly update to a new version but would still be downloading an older version (i.e., they would be stuck on the older version unless they run brew reinstall circuitjs1 after the dmg is updated). I'm not sure that we have an audit that would catch the mismatch between the cask version and plist version (or if it's even possible, since we have some multipart (CSV) cask versions), so this could be an issue. Thoughts on this situation, @homebrew/cask?

[If checking circuitjs1.java ends up being feasible, I'll add some suggestions to bring the livecheck block in line.]

[p-linnane]

I defer to you on this one @samford.

[samford]

@p-linnane With the above in mind, checking circuitjs1.java doesn't seem like an adequate alternative to ExtractPlist here, unfortunately. Without an audit to catch a version mismatch and prevent a version bump PR from being merged until the unversioned falstad.com dmg is updated, this setup would cause problems in ways that wouldn't be apparent on CI.

[p-linnane]

Thank you @samford. Closing per the above.