Update gomock dependency #1135

Job	Run time
quicktests	47s
lint	40s
coverage	1m 0s
unittests (ubuntu-22.04)	1m 34s
unittests (ubuntu-latest-arm-8-cores)	5m 21s
unittests (macos-13)	2m 16s
unittests (self-hosted, macos, arm64)	44s
unittests (windows-2022)	4m 4s
Build postcli (ubuntu-22.04)	59s
Build postcli (ubuntu-latest-arm-8-cores)	1m 33s
Build postcli (macos-13)	46s
Build postcli (self-hosted, macos, arm64)	17s
Build postcli (windows-2022)	1m 55s
Publish release	0s
	21m 56s

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