Update submodules/gatekeeper-library digest to 2838d19 #5426

Job	Run time
Checkout	7s
Generate a semantic version number	11s
codeql	1m 25s
js-get-deps	25s
js-build-binaries	47s
build-web-ui	15s
js-units	22s
publish-web-ui	0s
policytests (psp, fixtures)	1m 45s
release-binaries	0s
policytests (gatekeeper, fixtures)	4m 2s
policytests (kyverno, fixtures)	3m 0s
policytests (kubewarden, fixtures)	22m 58s
policytests (pss, fixtures)	3m 3s
policytests (krail, fixtures)	48s
policytests (kubewarden, e2e)	23m 10s
policytests (gatekeeper, e2e)	2m 29s
policytests (kyverno, e2e)	2m 28s
	1h 7m 15s

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