Use `keepnetwork/keep-client:v2.1.0` for `keep-maintainer` on product… #1

Job	Run time
client-detect-changes	2s
electrum-integration-detect-changes	3s
client-format	7s
client-build-test-publish	17m 45s
client-lint	3m 51s
client-scan	1m 21s
client-vet	1m 5s
client-integration-test	0s
	24m 14s

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