fix redownloading go-xcaddy every time, version 2.8.3 (#1034) #497

Job	Run time
Build SPC Binary for linux-aarch64	30s
Build SPC Binary for linux-x86_64	29s
Build SPC Binary for windows-x64	26s
Build SPC Binary for macos-aarch64	1m 10s
Build SPC Binary for macos-x86_64	1m 52s
Test SPC Binary for macos-aarch64	11s
Test SPC Binary for linux-aarch64	6s
Test SPC Binary for linux-x86_64	7s
Test SPC Binary for windows-x64	20s
Test SPC Binary for macos-x86_64	11s
	5m 22s

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