upgrade to go 1.25.6 to address HIGH vulnerability

[mattsanta]

Upgrade to go version 1.25.6 from 1.24.6 to address GHSA-7c64-f9jr-v9h2

#6047

[linux-foundation-easycla]

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• ✅ login: mattsanta / name: Matt Santa (0349cc4)

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Hi @mattsanta. Thanks for your PR.

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: mattsanta
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[mattsanta]

@koba1t - I noticed you actually wrote the PR for the previous go upgrade: #5959

Could you help review? I based my changes off your PR, which touched a ton of files.

[mattsanta]

@varshaprasad96 could you take a look at this PR? You were also assigned as a potential reviewer. If not can someone explain to me how to get attention to this PR? I've tried reaching out in the slack channel as well but no luck.