chore: add myself to CODEOWNERS, remove Diksha
Removal per
# review when someone opens a pull request.
* @amundsen-io/amundsen-committers
-*.py @feng-tao @jinhyukchang @allisonsuarez @dikshathakur3119 @verdan @bolkedebruin @mgorsk1
+*.py @allisonsuarez @bolkedebruin @feng-tao @dorianj @jinhyukchang @mgorsk1 @verdan
