chore(test): bump Go-version to 1.25 for tests (#3485)

I propose updating the minimum required Go version to 1.25.

We are not moving to 1.26 yet because our CI still builds on OpenSUSE
Leap 15, where Go 1.25 (1.25.8) is the version available in the base
repositories. Go 1.26 is currently only present in the devel repository.

Author: aleksraiden

tests/gocase/go.mod

@@ -1,6 +1,6 @@
 module github.com/apache/kvrocks/tests/gocase
 
-go 1.24.0
+go 1.25
 
 require (
 	github.com/redis/go-redis/v9 v9.17.2