Update submodules/gatekeeper-library digest to b1c2c88 #5377

Job	Run time
Checkout	4s
Generate a semantic version number	12s
codeql	1m 21s
js-get-deps	20s
js-units	18s
build-web-ui	16s
js-build-binaries	1m 5s
publish-web-ui	0s
policytests (psp, fixtures)	1m 47s
policytests (gatekeeper, fixtures)	2m 46s
release-binaries	0s
policytests (kyverno, fixtures)	2m 26s
policytests (kubewarden, fixtures)	22m 49s
policytests (pss, fixtures)	2m 20s
policytests (krail, fixtures)	51s
policytests (kubewarden, e2e)	23m 21s
policytests (gatekeeper, e2e)	2m 1s
policytests (kyverno, e2e)	2m 31s
	1h 4m 28s

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