Update CODEOWNERS (#1626)

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

Author: localstack-bot

CODEOWNERS

@@ -207,7 +207,7 @@
 /content/en/user-guide/aws/ssm/ @dominikschubert
 
 # stepfunctions
-/content/en/user-guide/aws/stepfunctions/ @MEPalma @joe4dev @dominikschubert @gregfurman
+/content/en/user-guide/aws/stepfunctions/ @MEPalma @joe4dev @gregfurman
 
 # sts
 /content/en/user-guide/aws/sts/ @pinzon @dfangl