Change version to 1.63.0 (#7050)

Co-authored-by: Doug Fawley <[email protected]>

Author: zasweq

version.go

@@ -19,4 +19,4 @@
 package grpc
 
 // Version is the current grpc version.
-const Version = "1.63.0-dev"
+const Version = "1.63.0"