chore: bump golang from `fe69f48` to `ca78a56` in /test/image #7633

Job	Run time
Test Gator	2m 30s
Check codegen and manifest	2m 2s
Build and Test (1.25.8)	7m 12s
[Generator Resource Expansion] Build and Test	7m 13s
Build and Test (1.26.3)	6m 39s
[Helm] Build and Test (3.7.2, gatekeeper-system)	5m 29s
Lint	1m 7s
Build and Test (1.27.1)	7m 16s
[Helm] Build and Test (3.7.2, custom-namespace)	5m 25s
Build and Test (1.28.0)	6m 33s
Unit test	7m 53s
	59m 19s

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