mergify-cli: Add version 2026.10.4

[riseproject-dev]

Automatically generated by the nightly check_versions.py run.

mergify-cli v2026.10.1 -> v2026.10.4

Every - version: entry added to docs/packages/mergify-cli.yaml is built by this PR's own build-mergify-cli.yml run; merging publishes the wheels.

[github-actions]

PR Preview Action v1.8.1
🚀 View preview at https://riseproject-dev.github.io/python-wheels/pr-preview/pr-2842/
Built to branch gh-pages at 2026-10-09 10:53 UTC. Preview will be ready when the GitHub Pages deployment is complete.

[luhenry]

Closing: not feasible to build. Confirmed by diffing the full git tree between tags 2026.10.3 and 2026.10.4 — starting at 2026.10.4, upstream removed all source code from the public repo. The tree now contains only AGENTS.md, README.md, docs/skill files and release scripts; there is no pyproject.toml, Cargo.toml, or crates/ anywhere. AGENTS.md itself states the public repo no longer holds the CLI's source ("Mergify develops, builds and releases the CLI elsewhere"). The PyPI release also switched its declared license from Apache-2.0 to LicenseRef-Mergify-Proprietary, with no sdist published for either 2026.10.3 or 2026.10.4.

There is nothing in this repo to build 2026.10.4 from. 2026.10.3 (still open-source) remains the latest buildable version; it's already tracked on main.

Note for whoever looks at this next: ci_scripts/check_versions.py will keep opening a PR like this one for every future mergify-cli release, since there's no mechanism to cap tracking at the last open-source version. Worth a gotcha entry and/or a way to mark this package's tracking as capped/deprecated.

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