switch CI to build using 25.12 #26

Job	Run time
Build for openwrt-25.12 / aarch64_cortex-a53	4m 19s
Build for openwrt-25.12 / mips_24kc	3m 45s
Build for openwrt-24.10 / aarch64_cortex-a53	4m 1s
Build for openwrt-24.10 / arm_cortex-a7	3m 58s
Build for openwrt-25.12 / arm_cortex-a7	3m 53s
Build for openwrt-25.12 / aarch64_generic	4m 7s
Build for openwrt-24.10 / x86_64	3m 45s
Build for openwrt-25.12 / x86_64	3m 43s
Build for openwrt-24.10 / mipsel_24kc	4m 3s
Build for openwrt-25.12 / arm_cortex-a9	3m 41s
Build for openwrt-24.10 / arm_cortex-a9	3m 53s
Build for openwrt-24.10 / aarch64_generic	4m 28s
Build for openwrt-25.12 / mipsel_24kc	3m 40s
Build for openwrt-24.10 / mips_24kc	4m 10s
Release stangri/https-dns-proxy	9s
	55m 35s

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