ci: fix gitleaks install path, downgrade golangci-lint to v1, relax m… #217

Job	Run time
markdown	12s
format	29s
module hygiene	22s
vet	1m 3s
secrets	6s
dependency review	0s
lint	16s
security	2m 45s
test (race + coverage)	2m 15s
build (${{ matrix.goos }}/${{ matrix.goarch }})	0s
	7m 28s

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