Change version to 1.74.2 (#8470)

diff --git a/version.go b/version.go
index fb0ce5c..8b0e5f9 100644
--- a/version.go
+++ b/version.go
@@ -19,4 +19,4 @@
 package grpc
 
 // Version is the current grpc version.
-const Version = "1.74.2-dev"
+const Version = "1.74.2"