chore: bump kubectl from 1.28.2 to v1.28.3 #7277

Job	Run time
Lint	1m 0s
Check codegen and manifest	3m 3s
Unit test	8m 51s
Build and Test (1.25.8)	9m 13s
Build and Test (1.26.3)	9m 34s
Build and Test (1.27.1)	10m 26s
[Generator Resource Expansion] Build and Test	10m 47s
Build and Test (1.28.0)	8m 47s
Test Gator	3m 39s
[Helm] Build and Test (3.7.2, gatekeeper-system)	7m 29s
[Helm] Build and Test (3.7.2, custom-namespace)	8m 13s
[Trivy] Scan for vulnerabilities	3m 45s
	1h 24m 47s

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