Update go version to 1.26.7

[madmuffin1]

a number of CVEs in go's stdlib have been published lately that are resolved in 1.26.7.

though most of them should not be affected in this project, this hygiene measure resolves alerts in environments that scan containers / binaries using tools like trivy etc.

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[it-percona-cla]

All committers have signed the CLA.

[ademidoff]

It's done, I believe we can close it.