Update Go to 1.26.10 and golangci-lint to 2.14.0

Daniel Keenanrequested to merge
go-1-26-10-cve-2026-111943-19-5 into 19-5-stable

Cherry-picks !7675 (merged) into 19-5-stable to bump Go to 1.26.10, fixing CVE-2026-111943.

Edited by Daniel Keenan

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