Bump golang from 1.22.5 to 1.23.0 in /.test-defs

[dependabot[bot]]

Bumps golang from 1.22.5 to 1.23.0.

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@dependabot[bot]: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-gardener-extension-shoot-rsyslog-relp-e2e-kind	64e797565c81031737b89743bfda41b7ce8f2065	link	true	/test pull-gardener-extension-shoot-rsyslog-relp-e2e-kind

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[plkokanov]

@dependabot close In favour of #160