.github: update CODEOWNERS
-.github/ @vito
-CODE_OF_CONDUCT.md @vito
-CONTRIBUTING.md @concourse/pivotal
-web/ @concourse/ux
-package.json @concourse/ux
-yarn.lock @concourse/ux
-fly/ @concourse/core-api @concourse/ux
-go-concourse/ @concourse/core-api
-atc/ @concourse/core-api
-skymarshal/ @concourse/core-api
-vars/ @concourse/core-api
-atc/exec/ @concourse/runtime @concourse/core-api
-atc/worker/ @concourse/runtime
-atc/runtime/ @concourse/runtime
-worker/ @concourse/runtime
-tsa/ @concourse/runtime
+.github/ @concourse/maintainers
+CODE_OF_CONDUCT.md @concourse/community
+CONTRIBUTING.md @concourse/maintainers
+web/ @concourse/maintainers
+package.json @concourse/maintainers
+yarn.lock @concourse/maintainers
+fly/ @concourse/maintainers
+go-concourse/ @concourse/maintainers
+atc/ @concourse/maintainers
+skymarshal/ @concourse/maintainers
+vars/ @concourse/maintainers
+atc/exec/ @concourse/maintainers
+atc/worker/ @concourse/maintainers
+atc/runtime/ @concourse/maintainers
+worker/ @concourse/maintainers
+tsa/ @concourse/maintainers
