Bump k8s.io/api from 0.23.5 to 0.28.2 in /extension/observer/k8sobserver #1427

Job	Run time
setup-environment	15m 41s
checks	15s
check-collector-module-version	8s
build-examples	55s
correctness-metrics	2m 49s
correctness-traces	3m 31s
integration-tests	8m 13s
lint	20s
unittest (1.18)	1m 2s
unittest (1.17)	1m 6s
cross-compile	0s
windows-msi	0s
build-package	0s
publish-check	0s
publish-dev	0s
publish-stable	0s
	34m 0s

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