ci: use Go 1.26 for CodeQL build

[turip]

Summary

• install Go 1.26.4 in the CodeQL Go workflow so the non-PR full build can compile the collector module
• include both root and collector go.sum files in setup-go's cache key

Root Cause

The non-PR CodeQL Go workflow installs Go from the root go.mod, which is currently 1.25.6, then runs make build GO_BUILD_FLAGS=. That aggregate build includes build-benthos-collector, but collector/go.mod requires Go 1.26.4 and the job runs with GOTOOLCHAIN=local, so the collector build fails before CodeQL analysis.

Validation

• git diff --check

Summary by CodeRabbit

• Chores
  • Updated the Go CodeQL workflow to use a fixed Go version and improved dependency caching for faster, more consistent CI runs.

Greptile Summary

This PR updates the Go CodeQL workflow for the collector build. The main changes are:

• Pins actions/setup-go to Go 1.26.4.
• Keeps Go module caching enabled.
• Adds both root and collector go.sum files to the cache key.

Confidence Score: 5/5

This looks safe to merge.

• No blocking issues found in the changed code.

Important Files Changed

Filename	Overview
.github/workflows/codeql-go.yaml	Updates the CodeQL Go setup step to use Go 1.26.4 and include both module sum files in setup-go caching.

_{Reviews (1): Last reviewed commit: "ci: use collector Go version for CodeQL ..." | Re-trigger Greptile}

Context used (3)

• Context used - CLAUDE.md (source)
• Context used - AGENTS.md (source)
• Context used - api/spec/AGENTS.md (source)

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 7051a787-3a1b-4828-a4ae-075a3a5ab025

📥 Commits

Reviewing files that changed from the base of the PR and between 2ce60f3 and 736000d.

📒 Files selected for processing (1)

• .github/workflows/codeql-go.yaml

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📝 Walkthrough

Walkthrough

Hey team! Quick one here — the CodeQL Go workflow's "Set up Go" step now pins a fixed Go version (1.26.4) instead of reading it from go.mod, and it broadens the cache dependency path to cover both go.sum and collector/go.sum.

Changes

CodeQL Go Workflow Update

Layer / File(s)	Summary
Set up Go step configuration .github/workflows/codeql-go.yaml	Switches from go-version-file: go.mod to a fixed go-version: 1.26.4, and adds collector/go.sum to the cache dependency path alongside the root go.sum.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Possibly related PRs

• openmeterio/openmeter#4305: Prior PR that introduced/managed the same CodeQL Go workflow's Go setup and cache dependency configuration.

Suggested labels: release-note/ignore

Suggested reviewers: tothandras

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly reflects the main change: updating the CodeQL build to use Go 1.26.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/fix-codeql-go-toolchain

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