Update submodules/gatekeeper-library digest to b1c2c88 #5346

Job	Run time
Generate a semantic version number	14s
Checkout	7s
js-get-deps	24s
codeql	1m 26s
js-build-binaries	50s
js-units	19s
build-web-ui	19s
publish-web-ui	0s
policytests (psp, fixtures)	1m 45s
release-binaries	0s
policytests (gatekeeper, fixtures)	2m 23s
policytests (kyverno, fixtures)	2m 22s
policytests (kubewarden, fixtures)	23m 19s
policytests (pss, fixtures)	3m 4s
policytests (krail, fixtures)	52s
policytests (kubewarden, e2e)	23m 11s
policytests (gatekeeper, e2e)	2m 13s
policytests (kyverno, e2e)	3m 0s
	1h 5m 48s

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