(maint) Remove teams from CODEOWNERS

This commit transfers ownership of certain parts of the codebase
from the PDK GitHub team to the larger, more current Modules GitHub
team.

Additionally, it removes the puppetserver-maintainers team, which
appears to no longer exist.

Author: mhashizume

CODEOWNERS

@@ -1,11 +1,11 @@
 # defaults
-* @puppetlabs/phoenix @puppetlabs/puppetserver-maintainers
+* @puppetlabs/phoenix
 
 # PAL
 /lib/puppet/pal @puppetlabs/bolt
 
 # puppet module
-/lib/puppet/application/module.rb @puppetlabs/pdk
-/lib/puppet/face/module @puppetlabs/pdk
-/lib/puppet/forge @puppetlabs/pdk
-/lib/puppet/module_tool @puppetlabs/pdk
+/lib/puppet/application/module.rb @puppetlabs/modules
+/lib/puppet/face/module @puppetlabs/modules
+/lib/puppet/forge @puppetlabs/modules
+/lib/puppet/module_tool @puppetlabs/modules