Update submodules/gatekeeper-library digest to c261fbb #5397

Job	Run time
Checkout	8s
Generate a semantic version number	10s
codeql	1m 21s
js-get-deps	20s
js-build-binaries	1m 8s
build-web-ui	13s
js-units	22s
publish-web-ui	0s
policytests (psp, fixtures)	1m 54s
policytests (gatekeeper, fixtures)	2m 13s
policytests (kyverno, fixtures)	3m 19s
release-binaries	0s
policytests (kubewarden, fixtures)	24m 6s
policytests (pss, fixtures)	2m 46s
policytests (krail, fixtures)	53s
policytests (kubewarden, e2e)	23m 17s
policytests (gatekeeper, e2e)	2m 48s
policytests (kyverno, e2e)	2m 40s
	1h 7m 38s

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