add aryanishan1001 as codeowner for webserver module (open-telemetry#475)

Author: lalitb

.github/CODEOWNERS

@@ -9,4 +9,4 @@
 
 instrumentation/httpd/ @TomRoSystems @open-telemetry/cpp-contrib-approvers
 instrumentation/nginx/ @seemk @tobiasstadler @open-telemetry/cpp-contrib-approvers
-instrumentation/otel-webserver-module/ @kpratyus @ajaynagariya @debajitdas @open-telemetry/cpp-contrib-approvers
+instrumentation/otel-webserver-module/ @kpratyus @ajaynagariya @debajitdas @aryanishan1001 @open-telemetry/cpp-contrib-approvers