add webseed update timer #1226

Job	Run time
test-386 (1.20)	3m 15s
bench (1.20)	3m 52s
build-wasm (1.20)	1m 13s
test (1.19, windows-latest)	4m 3s
test-benchmarks (1.20)	3m 43s
test (1.19, macos-latest)	2m 24s
torrentfs-linux (1.20, ubuntu-latest)	2m 22s
test (1.19, ubuntu-latest)	2m 23s
test (1.20, windows-latest)	6m 21s
test (1.20, macos-latest)	2m 0s
test (1.20, ubuntu-latest)	2m 46s
	34m 22s

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