chore(master): release 1.21.0

[yordis]

🤖 I have created a release beep boop

1.21.0 (2026-07-18)

Features

• add support for the HTTP QUERY method (RFC 10008) (#896) (c3b7bf5)

Bug Fixes

• ci: bump release workflow to OTP 28.5 (#888) (aa22331)
• ci: bump test matrix to OTP 28.5 (#899) (279f8bc)
• handle atom header keys in FollowRedirects header filtering (#898) (a3d6c94)
• silence compiler warnings on Elixir 1.20.1 (#892) (863d836)

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[cursor]

PR Summary

Low Risk
Version and changelog-only changes with no runtime library code in the diff.

Overview
Release 1.21.0 — bumps @version in mix.exs from 1.20.0 to 1.21.0 and adds the corresponding 1.21.0 section at the top of CHANGELOG.md.

The changelog entry documents what ships in this tag (not changed in this PR’s diff): HTTP QUERY method support (RFC 10008), FollowRedirects fixes for atom header keys, Elixir 1.20.1 compiler-warning silencing, and CI updates to OTP 28.5.

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[Copilot]

Pull request overview

Bumps the library version and updates the changelog to publish the v1.20.1 patch release generated by Release Please, reflecting the CI fix (OTP 28.5 in release workflow) merged in #888.

Changes:

• Update mix.exs project version to 1.20.1.
• Add a 1.20.1 entry to CHANGELOG.md documenting the CI bug fix included in the release.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
mix.exs	Updates @version to 1.20.1 so the published package/version metadata matches the release.
CHANGELOG.md	Adds the 1.20.1 release notes section with the included CI fix reference.

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