fix(e2e): correct Go version from non-existent 1.24 to 1.23

Go version 1.24 does not exist (versions go 1.22 → 1.23 → 1.25).
PR #655 mistakenly specified go 1.24, causing build failures on systems
without the latest Go toolchain.

Using go 1.23 as the minimum requirement for broader compatibility.

Signed-off-by: Yossi Ovadia <[email protected]>

Author: yossiovadia

e2e/go.mod

@@ -1,6 +1,6 @@
 module github.com/vllm-project/semantic-router/e2e
 
-go 1.24
+go 1.23
 
 require (
 	k8s.io/api v0.31.0