Releasing a new version of Leaflet

Ensure all https://github.com/Leaflet/Leaflet/labels/blocker issues and pull requests are resolved.
Update the changelog since last release and commit.
Make sure all tests pass on CI before proceeding.
Run npm version <patch | minor | major> (this will bump the version in package.json and create a new tag).
Run git push --follow-tags to push the commit created by NPM to Github (together with the tag).
Wait for the CI to complete and follow the logs to make sure it runs successfully.
Verify that the release was correctly published to NPM by checking:
- Leaflet NPM package page
- files on Leaflet unpkg page
Make a new release on Leaflet's GitHub release page with the most important parts of the changelog
Download zip archive from https://leafletjs-cdn.s3.amazonaws.com/content/leaflet/vX.X.X/leaflet.zip (where X.X.X is the new version number) and upload it as an "asset" of the GitHub release.

Make a new branch for the update
Write a blog post about the new release and put it in /docs/_posts/
Click here to save a snapshot of the version of docs prior to this release to the Internet Archive's Wayback Machine (and optionally, add a link to the snapshot in docs/reference-versions.html).
Run npm run docs to generate the new docs/reference.html and update integrity hashes in docs/_config.yml
Update link to latest release in docs/download.md
Update the announcement section in docs/index.html
Commit all the changes and submit a PR for someone to review

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