Add 2 more Dublin teammates as owners for the native auth feature (#8058)

Author: shenj

CODEOWNERS

@@ -1,8 +1,8 @@
 * @AzureAD/msal-js-public-client
 
 # MSAL Browser
-/lib/msal-browser/src/custom_auth/ @shenj @yongdiw @nilo-ms
-/lib/msal-browser/test/custom_auth/ @shenj @yongdiw @nilo-ms
+/lib/msal-browser/src/custom_auth/ @shenj @yongdiw @nilo-ms @spetrescu84 @mustafamizrak
+/lib/msal-browser/test/custom_auth/ @shenj @yongdiw @nilo-ms @spetrescu84 @mustafamizrak
 
 # MSAL Node
 /lib/msal-node/ @AzureAD/msal-js-public-client @AzureAD/id4s-msal-team