fix grammar mistake

Author: Joshix-1

CODE_OF_CONDUCT.md

@@ -2,7 +2,7 @@
 
 Please note that all interactions on
 [Python Software Foundation](https://www.python.org/psf-landing/)-supported
-infrastructure is [covered](https://www.python.org/psf/records/board/minutes/2014-01-06/#management-of-the-psfs-web-properties)
+infrastructure are [covered](https://www.python.org/psf/records/board/minutes/2014-01-06/#management-of-the-psfs-web-properties)
 by the [PSF Code of Conduct](https://www.python.org/psf/codeofconduct/),
 which includes all the infrastructure used in the development of Python itself
 (e.g. mailing lists, issue trackers, GitHub, etc.).