Update caddy.yml

Author: lxhao61

.github/workflows/caddy.yml

@@ -85,7 +85,7 @@ jobs:
     - name: Install go
       uses: actions/setup-go@v5
       with:
-        go-version: '1.25'
+        go-version: '1.26'
         check-latest: true
 
     - name: Install xcaddy