Adding other SSPs to codepath-notification (#3808)

Author: bretg

.github/workflows/scripts/codepath-notification

@@ -17,3 +17,7 @@
 # The aim is to find a minimal set of regex patterns that matches any file in these paths
 
 /ix|Ix|ix.json|ix.yaml: pdu-supply-prebid@indexexchange.com
+appnexus|Appnexus: prebid@microsoft.com
+pubmatic|Pubmatic: header-bidding@pubmatic.com
+openx|OpenX: prebid@openx.com
+medianet|Medianet: prebid@media.net