switch CI to build using 25.12

Author: stangri

.github/workflows/openwrt-release.yml

@@ -33,19 +33,19 @@ jobs:
             target: mips_24kc
           - version: openwrt-24.10
             target: mipsel_24kc
-          - version: snapshots
+          - version: openwrt-25.12
             target: x86_64
-          - version: snapshots
+          - version: openwrt-25.12
             target: aarch64_cortex-a53
-          - version: snapshots
+          - version: openwrt-25.12
             target: aarch64_generic
-          - version: snapshots
+          - version: openwrt-25.12
             target: arm_cortex-a7
-          - version: snapshots
+          - version: openwrt-25.12
             target: arm_cortex-a9
-          - version: snapshots
+          - version: openwrt-25.12
             target: mips_24kc
-          - version: snapshots
+          - version: openwrt-25.12
             target: mipsel_24kc
 
     steps: