fix: does not generate codeowners (#631)

Prevents the re-generation of the github CODEOWNERS file.

Author: thiagotnunes

synth.py

@@ -88,4 +88,5 @@
     'samples/install-without-bom/pom.xml',
     'samples/snapshot/pom.xml',
     'samples/snippets/pom.xml',
+    '.github/CODEOWNERS',
 ])