chore(internal/gapicgen): remove noahdietz as reviewer (#3085)

diff --git a/internal/gapicgen/cmd/genbot/github.go b/internal/gapicgen/cmd/genbot/github.go
index 1c94471..d9bede8 100644
--- a/internal/gapicgen/cmd/genbot/github.go
+++ b/internal/gapicgen/cmd/genbot/github.go
@@ -69,7 +69,7 @@
 // review the PRs.
 //
 // TODO(ndietz): Can we use github teams?
-var githubReviewers = []string{"hongalex", "broady", "noahdietz", "tritone", "codyoss", "tbpg"}
+var githubReviewers = []string{"hongalex", "broady", "tritone", "codyoss", "tbpg"}
 
 // PullRequest represents a GitHub pull request.
 type PullRequest struct {