Update submodules/gatekeeper-library digest to e8ca0c8 #4138

Job	Run time
Checkout	6s
Generate a semantic version number	11s
codeql	1m 32s
js-get-deps	18s
js-units	17s
build-web-ui	18s
js-build-binaries	1m 3s
publish-web-ui	0s
policytests (psp, fixtures)	1m 56s
policytests (gatekeeper, fixtures)	2m 35s
release-binaries	0s
policytests (kyverno, fixtures)	2m 31s
policytests (kubewarden, fixtures)	24m 49s
policytests (pss, fixtures)	3m 17s
policytests (krail, fixtures)	48s
policytests (kubewarden, e2e)	23m 28s
policytests (gatekeeper, e2e)	2m 4s
policytests (kyverno, e2e)	2m 33s
	1h 7m 46s

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