Update submodules/gatekeeper-library digest to b1c2c88 #5356

Job	Run time
Checkout	4s
Generate a semantic version number	10s
js-get-deps	22s
codeql	1m 27s
build-web-ui	14s
js-units	23s
js-build-binaries	45s
publish-web-ui	0s
policytests (psp, fixtures)	1m 56s
policytests (gatekeeper, fixtures)	2m 21s
release-binaries	0s
policytests (kyverno, fixtures)	3m 6s
policytests (kubewarden, fixtures)	25m 22s
policytests (pss, fixtures)	2m 20s
policytests (krail, fixtures)	54s
policytests (kubewarden, e2e)	23m 29s
policytests (gatekeeper, e2e)	3m 24s
policytests (kyverno, e2e)	3m 5s
	1h 9m 22s

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