update heartbeat domain URL to mossdef.org #53

Job	Run time
Functional tests	4s
Build for openwrt-24.10 / mips_24kc	3m 52s
Build for openwrt-24.10 / aarch64_cortex-a53	4m 24s
Build for openwrt-24.10 / x86_64	18m 52s
Build for openwrt-25.12 / x86_64	4m 34s
Build for openwrt-24.10 / aarch64_generic	6m 56s
Build for openwrt-25.12 / arm_cortex-a7	6m 31s
Build for openwrt-25.12 / aarch64_cortex-a53	16m 48s
Build for openwrt-25.12 / arm_cortex-a9	11m 7s
Build for openwrt-25.12 / mips_24kc	7m 10s
Build for openwrt-24.10 / arm_cortex-a7	11m 4s
Build for openwrt-25.12 / aarch64_generic	4m 4s
Build for openwrt-24.10 / mipsel_24kc	7m 3s
Build for openwrt-25.12 / mipsel_24kc	3m 35s
Build for openwrt-24.10 / arm_cortex-a9	5m 7s
Release mossdef-org/https-dns-proxy	7s
	1h 51m 18s

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