Change the version to release 1.79.2 (#8947)

Patch Release for v1.79.2

RELEASE NOTES: none

version.go

diff --git a/version.go b/version.go
index 043a7fe..f9da6c6 100644
--- a/version.go
+++ b/version.go
@@ -19,4 +19,4 @@
 package grpc
 
 // Version is the current grpc version.
-const Version = "1.79.2-dev"
+const Version = "1.79.2"