Remove myself from CODEOWNERS for SignalR (#8434)

I love me some SignalR but with BRT and such I need to focus my notifications :'(

Author: analogrelay

.github/CODEOWNERS

@@ -15,4 +15,4 @@
 /src/Servers/ @tratcher @jkotalik
 /src/Middleware/Rewrite @jkotalik
 /src/Middleware/HttpsPolicy @jkotalik
-/src/SignalR/ @mikaelm12 @BrennanConroy @halter73 @anurse
+/src/SignalR/ @mikaelm12 @BrennanConroy @halter73