[Chapel Merge] CONTRIBUTORS.md for 1.30

Branch: refs/heads/main
Revision: b62837ee5ed2eac9622f495c12600e55f6610c40
Author: bradcray
Link: CONTRIBUTORS.md for 1.30 by bradcray · Pull Request #21840 · chapel-lang/chapel · GitHub
Log Message:
CONTRIBUTORS.md for 1.30 (#21840)

[trivial, and reviewed by new contributors]

Update the contributors file to highlight those who have contributed to
Chapel 1.30. I also simplified the header line to make it shorter and
suggest that it's speaking about the file's contents as a whole and not
just the first section.

Compare: Comparing 9724c4d74d1f5d396bf90f3f0e53bfc00b60a5e1...a82fbf28e4687ed80ed12463a7093f3cf13ffcf5 · chapel-lang/chapel · GitHub

Diff:
M CONTRIBUTORS.md
https://github.com/chapel-lang/chapel/pull/21840.diff