Update CODEOWNERS (#1514)

Co-authored-by: LocalStack Bot <localstack-bot@users.noreply.github.com>

Author: localstack-bot

CODEOWNERS

@@ -129,7 +129,7 @@
 /content/en/user-guide/aws/kms/ @sannya-singal
 
 # lambda
-/content/en/user-guide/aws/lambda/ @joe4dev @dominikschubert @dfangl
+/content/en/user-guide/aws/lambda/ @joe4dev @dominikschubert @dfangl @gregfurman
 
 # logs
 /content/en/user-guide/aws/logs/ @pinzon @steffyP