fix(e2e): downgrade Go requirement from 1.24 to 1.22 for compatibility

Go 1.24 hasn't been released yet, causing build failures on systems with Go 1.22.
This is a temporary fix to enable testing on current Go versions.

Signed-off-by: Yossi Ovadia <yovadia@redhat.com>

Author: yossiovadia

e2e/go.mod

@@ -1,6 +1,6 @@
 module github.com/vllm-project/semantic-router/e2e
 
-go 1.24
+go 1.22
 
 require (
 	k8s.io/api v0.31.0