Updated go to 1.26.1

[getvictor]

Related issue: Resolves #41749

Checklist for submitter

• Changes file added for user-visible changes in changes/, orbit/changes/ or ee/fleetd-chrome/changes.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.43%. Comparing base (80eec81) to head (bf232de).
⚠️ Report is 30 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #42027      +/-   ##
==========================================
+ Coverage   66.42%   66.43%   +0.01%     
==========================================
  Files        2511     2512       +1     
  Lines      200776   201422     +646     
  Branches     8907     8907              
==========================================
+ Hits       133357   133810     +453     
- Misses      55364    55528     +164     
- Partials    12055    12084      +29     

Flag	Coverage Δ
backend	68.21% <ø> (+<0.01%)	⬆️
backend-activity	86.35% <ø> (ø)

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[claude]

Claude Code Review

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[Copilot]

Pull request overview

Updates the repository’s Go version references to Go 1.26.1 to keep Fleet and its related tooling aligned with the targeted Go release (per #41749).

Changes:

• Bumped the go directive to 1.26.1 in the main module and several tooling modules.
• Updated Golang builder base images in Dockerfiles to golang:1.26.1 (with pinned digests).
• Added changelog entries under changes/ and orbit/changes/ noting the Go update.

Reviewed changes

Copilot reviewed 11 out of 12 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
go.mod	Updates main module Go version to 1.26.1.
tools/terraform/go.mod	Updates terraform provider tool module Go version to 1.26.1.
tools/snapshot/go.mod	Updates snapshot tool module Go version to 1.26.1.
tools/qacheck/go.mod	Updates qacheck tool module Go version to 1.26.1.
tools/mdm/windows/bitlocker/go.mod	Updates bitlocker tool module Go version to 1.26.1.
tools/github-manage/go.mod	Updates GitHub management tool module Go version to 1.26.1.
third_party/vuln-check/go.mod	Updates vuln-check module Go version to 1.26.1.
tools/mdm/migration/mdmproxy/Dockerfile	Updates builder image to Go 1.26.1 (pinned digest).
infrastructure/loadtesting/terraform/docker/loadtest.Dockerfile	Updates builder image to Go 1.26.1 (pinned digest).
Dockerfile-desktop-linux	Updates builder image to Go 1.26.1 (pinned digest).
changes/update-go-1.26.1	Adds user-visible change entry for Go update.
orbit/changes/update-go-1.26.1	Adds Orbit change entry for Go update.

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