Fix test matrix: use Go 1.25/1.26 (keep 1.24 for lint/build)

Co-authored-by: Shelley <shelley@exe.dev>

Author: exedev

.github/workflows/test.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go-version: ['1.23', '1.24']
+        go-version: ['1.25', '1.26']
 
     steps:
       - name: Checkout code