go.mod: Bump to Go v1.25

Let's raise the minimum required Go version for the next minor StateDB release.
This will allow using 'synctest' in the tests here.

Signed-off-by: Jussi Maki <jussi.maki@isovalent.com>

Author: joamaki

.github/workflows/main.yml

@@ -5,7 +5,7 @@ on:
     - main
 
 env:
-  GO_VERSION: 1.23
+  GO_VERSION: 1.25.6
 
 jobs:
   test:

.github/workflows/pr.yml

@@ -5,7 +5,7 @@ on:
     - main
 
 env:
-  GO_VERSION: 1.23
+  GO_VERSION: 1.25.6
 
 jobs:
   test:

go.mod

@@ -1,6 +1,6 @@
 module github.com/cilium/statedb
 
-go 1.24
+go 1.25
 
 require (
 	github.com/cilium/hive v0.0.0-20250731144630-28e7a35ed227