perf(find-plugin): convert unused capture group to non-capture group

[Fdawgs]

Changed capture groups (...) to non-capture groups (?:...), as nothing is done with the captured text, so the regex engine is doing extra work capturing and storing text only to end up not using it.

Checklist

• run npm run test and npm run benchmark
• commit message and code follows the Developer's Certification of Origin
  and the Code of conduct

[mcollina]

lgtm