Add myself to the pug_sphinx_extensions codeowners

Signed-off-by: Filipe Laíns <[email protected]>

Author: FFY00

.github/CODEOWNERS

@@ -1,6 +1,9 @@
 source/guides/github-actions-ci-cd-sample/* @webknjaz
 source/guides/publishing-package-distribution-releases-using-github-actions-ci-cd-workflows.rst @webknjaz
 
+# Sphinx extension
+pug_sphinx_extensions/ @FFY00
+
 # build-details.json
 source/specifications/build-details/ @FFY00
 source/specifications/specs/build-details-*.json @FFY00