chore(deps): bump golang from 1.25 to 1.26 in /cmd/trainer-controller-manager

[dependabot]

Bumps golang from 1.25 to 1.26.

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[coveralls]

Pull Request Test Coverage Report for Build 22080713572

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 56.026%

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Totals
Change from base Build 22051165353:	0.0%
Covered Lines:	1390
Relevant Lines:	2481

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💛 - Coveralls

[jiayuzhao05]

GPU E2E failed due to missing runner group 'GPUs' which looks like an infra issue, not related to this PR.