build(deps): bump github.com/onsi/ginkgo/v2 from 2.14.0 to 2.15.0 #9273

Job	Run time
codegen	1m 16s
Codespell	13s
lint	34s
test-linux	2m 58s
build-image	2m 18s
test-osx	7m 5s
gateway-conformance	5m 56s
upgrade (kubernetes:latest)	4m 48s
e2e (kubernetes:latest, ConfigmapConfiguration)	28m 8s
upgrade (kubernetes:n-1)	4m 55s
e2e (kubernetes:latest, ContourConfiguration)	21m 11s
upgrade (kubernetes:n-2)	4m 48s
e2e (kubernetes:n-1, ConfigmapConfiguration)	27m 5s
e2e (kubernetes:n-1, ContourConfiguration)	23m 22s
e2e (kubernetes:n-2, ConfigmapConfiguration)	29m 18s
e2e (kubernetes:n-2, ContourConfiguration)	23m 32s
	3h 7m 27s

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