Update submodules/gatekeeper-library digest to b1c2c88 #5301

Job	Run time
Checkout	7s
Generate a semantic version number	13s
codeql	1m 27s
js-get-deps	17s
js-units	19s
build-web-ui	17s
js-build-binaries	46s
publish-web-ui	0s
policytests (psp, fixtures)	1m 52s
policytests (gatekeeper, fixtures)	2m 27s
release-binaries	0s
policytests (kyverno, fixtures)	2m 27s
policytests (kubewarden, fixtures)	19m 23s
policytests (pss, fixtures)	2m 44s
policytests (krail, fixtures)	50s
policytests (kubewarden, e2e)	20m 23s
policytests (gatekeeper, e2e)	2m 12s
policytests (kyverno, e2e)	2m 24s
	58m 8s

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