chore: bump Go to 1.26.7 and mcms to v0.55.0

[ilija42]

• go.mod (root), .tool-versions, integration-tests/.tool-versions: Go 1.26.6 -> 1.26.7
• deployment + core/scripts + integration-tests(+load) + system-tests(lib,tests): mcms -> v0.55.0, chainlink-stellar -> v0.0.5 (+bindings), tidy
• go.md regenerated

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-01T18:59:05.424534Z	3b66724	PR opened

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[github-actions]

👋 ilija42, thanks for creating this pull request!

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[github-actions]

I see you updated files related to core. Please run make gocs in the root directory to add a changeset as well as in the text include at least one of the following tags:

• #added For any new functionality added.
• #breaking_change For any functionality that requires manual action for the node to boot.
• #bugfix For bug fixes.
• #changed For any change to the existing functionality.
• #db_update For any feature that introduces updates to database schema.
• #deprecation_notice For any upcoming deprecation functionality.
• #internal For changesets that need to be excluded from the final changelog.
• #nops For any feature that is NOP facing and needs to be in the official Release Notes for the release.
• #removed For any functionality/config that is removed.
• #updated For any functionality that is updated.
• #wip For any change that is not ready yet and external communication about it should be held off till it is feature complete.

[github-actions]

✅ No conflicts with other open PRs targeting develop

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 3b66724e2d

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".

[chatgpt-codex-connector]

Align the Docker builders with the new Go minimum

The root module now requires Go 1.26.7, but both core/chainlink.Dockerfile:8 and plugins/chainlink.Dockerfile:10 still use golang:1.26.6-bookworm before copying this go.mod and running Go commands. In the image builds referenced by .github/workflows/build-publish.yml and .github/workflows/docker-build.yml, this either forces an unpinned automatic toolchain download or fails when toolchain auto-downloads are disabled/unavailable, so the release and test builders should be bumped alongside the module.

Useful? React with 👍 / 👎.

[trunk-io]

   

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[cl-sonarqube-production]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarQube