Revert "Merge pull request #2159 from bnbarham/update-codeowners"

This reverts commit 66b20b9, reversing
changes made to 8e8016e. Codeowners are
branch managers on the release branch.

Author: bnbarham

.github/CODEOWNERS

@@ -8,4 +8,4 @@
 # Order is important. The last matching pattern has the most precedence.
 
 # Owner of anything in SourceKit-LSP not owned by anyone else.
-* @ahoppen @bnbarham @hamishknight @rintaro
+* @ahoppen