chore(deps): bump go directive to 1.26.4

[bdsoha]

The go directive in go.mod is pinned to 1.26.1. That patch still carries the stdlib advisories that were fixed across 1.26.2–1.26.4.

build.yaml sets up Go with go-version-file: go.mod, so CI keeps building and testing on 1.26.1, and anyone building from source inherits the same floor. Bumping the directive to 1.26.4 pulls in the patched stdlib.

Module dependencies are already current on main, so this is toolchain-only — go mod tidy is otherwise a no-op.

Checked locally before opening:

• go build ./... and go vet ./... pass
• go test ./... passes
• govulncheck ./... reports no vulnerabilities

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Central YAML (base), Organization UI (inherited)

Review profile: CHILL

Plan: Enterprise

Run ID: 5ac26344-dc75-462a-ac62-ab16a637ad82

📥 Commits

Reviewing files that changed from the base of the PR and between eab6d87 and 3809a84.

📒 Files selected for processing (1)

• go.mod

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📝 Walkthrough

Summary by CodeRabbit

• Chores
  • Updated the Go toolchain version used by the project to a newer patch release, with no changes to app behavior or dependencies.

Walkthrough

go.mod updates the go directive from 1.26.1 to 1.26.4.

Changes

Go toolchain update

Layer / File(s)	Summary
Go directive update go.mod	The module's Go version directive changes from 1.26.1 to 1.26.4.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: bumping the Go directive to 1.26.4.
Description check	✅ Passed	The description is directly related to the change and explains the toolchain-only Go version bump.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

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• Create PR with unit tests

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 30.71%. Comparing base (dbd7529) to head (3809a84).
⚠️ Report is 318 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1210       +/-   ##
===========================================
- Coverage   62.36%   30.71%   -31.65%     
===========================================
  Files         197      239       +42     
  Lines        4854     6534     +1680     
===========================================
- Hits         3027     2007     -1020     
- Misses       1439     4351     +2912     
+ Partials      388      176      -212     

Flag	Coverage Δ
unit	30.71% <ø> (-31.65%)	⬇️

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