Update submodules/gatekeeper-library digest to b1c2c88 #5374

Job	Run time
Generate a semantic version number	10s
Checkout	4s
codeql	1m 27s
js-get-deps	18s
build-web-ui	15s
js-units	21s
js-build-binaries	46s
publish-web-ui	0s
policytests (psp, fixtures)	1m 47s
policytests (gatekeeper, fixtures)	2m 38s
release-binaries	0s
policytests (kyverno, fixtures)	2m 46s
policytests (kubewarden, fixtures)	23m 2s
policytests (pss, fixtures)	3m 14s
policytests (krail, fixtures)	48s
policytests (kubewarden, e2e)	23m 4s
policytests (gatekeeper, e2e)	2m 32s
policytests (kyverno, e2e)	3m 34s
	1h 6m 46s

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