[Chapel Merge] Unpin llvm for homebrew

Branch: refs/heads/main
Revision: c137153a1043a297929c684f4d0cd7979fdf9241
Author: jabraham17
Link: Unpin llvm for homebrew by jabraham17 · Pull Request #28370 · chapel-lang/chapel · GitHub
Log Message:
Unpin llvm for homebrew (#28370)

Unpins the LLVM for homebrew since homebrew style disallows the pin

[Not reviewed - trivial]

Compare: Comparing a902cde841163ab34f3ab0368f963fe58af56272...e677ace6c8280e5b9ee5e5e0315bb6ea61c4f327 · chapel-lang/chapel · GitHub

Diff:
M util/packaging/homebrew/chapel-main.rb
https://github.com/chapel-lang/chapel/pull/28370.diff