Update submodules/gatekeeper-library digest to e8ca0c8 #4133

Job	Run time
Checkout	6s
Generate a semantic version number	10s
js-get-deps	27s
codeql	1m 29s
build-web-ui	15s
js-units	19s
js-build-binaries	49s
publish-web-ui	0s
policytests (psp, fixtures)	1m 50s
release-binaries	0s
policytests (gatekeeper, fixtures)	2m 34s
policytests (kyverno, fixtures)	2m 34s
policytests (kubewarden, fixtures)	23m 2s
policytests (pss, fixtures)	3m 8s
policytests (krail, fixtures)	49s
policytests (kubewarden, e2e)	23m 14s
policytests (gatekeeper, e2e)	2m 6s
policytests (kyverno, e2e)	3m 1s
	1h 5m 53s

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