chore: bump golang from `23ad9fe` to `26c7537` in /test/image #7109

Job	Run time
Build and Test (1.25.8)	11m 20s
Lint	24s
Build and Test (1.26.3)	9m 59s
Check codegen and manifest	3m 9s
Unit test	10m 14s
Build and Test (1.27.1)	9m 53s
Build and Test (1.28.0)	8m 31s
[Generator Resource Expansion] Build and Test	12m 30s
Test Gator	3m 40s
[Helm] Build and Test (3.7.2, gatekeeper-system)	7m 11s
[Helm] Build and Test (3.7.2, custom-namespace)	8m 1s
[Trivy] Scan for vulnerabilities	3m 51s
	1h 28m 43s

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