Change version to 1.61.2 (#7087)

version.go

diff --git a/version.go b/version.go
index 9879ac4..856ac2f 100644
--- a/version.go
+++ b/version.go
@@ -19,4 +19,4 @@
 package grpc
 
 // Version is the current grpc version.
-const Version = "1.61.2-dev"
+const Version = "1.61.2"