chore(master): release 1.21.0

[yordis]

🤖 I have created a release beep boop

1.21.0 (2026-07-09)

Features

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

Bug Fixes

• ci: bump release workflow to OTP 28.5 (#888) (aa22331)
• silence compiler warnings on Elixir 1.20.1 (#892) (863d836)

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This PR was generated with Release Please. See documentation.

[cursor]

PR Summary

Low Risk
Version and changelog-only change with no runtime code modifications in this diff.

Overview
Release 1.21.0 packaging only: bumps @version in mix.exs from 1.20.0 to 1.21.0 and prepends a 1.21.0 section to CHANGELOG.md (dated 2026-07-09).

The changelog entry records what shipped since the last release—HTTP QUERY (RFC 10008), CI OTP 28.5, and Elixir 1.20.1 compiler-warning fixes—not new code in this PR.

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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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