chore: release reactivex@5.0.0-rc.1 (#769)

* chore: release reactivex@5.0.0-rc.1

* docs(changelog): fold Unreleased bullets into 5.0.0-rc.1 section

The content ShipIt auto-generated for the 5.0.0-rc.1 section was only
a compare-link because all commits in the release window used the ci:
and docs: types (which ShipIt treats as non-user-facing). The real
release notes for 5.0.0-rc.1 are the bullets that had been sitting
under ## Unreleased -- work done between 5.0.0a2 and now. Move them
under the 5.0.0-rc.1 heading so readers see a populated release.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: 🤖 easybuild-shipit <github-actions[bot]@users.noreply.github.com>
Co-authored-by: Dag Brattli <dag@brattli.net>
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: 3 people

CHANGELOG.md

@@ -1,8 +1,7 @@
 ---
-name: reactivex
-last_commit_released: 8b59bc7394f1b6a8a78e2fc4b5efe200d4f47f89
+last_commit_released: 2975deb528c9eec73c76cf8bb53fc8780f31de45
 pre_release: rc
-force_version: 5.0.0-rc.1
+name: reactivex
 updaters:
   - command: ./scripts/shipit_bump_version.sh {version}
 ---
@@ -17,7 +16,9 @@ conventional-commit messages.
 PyPI uses PEP 440 (`5.0.0rc1`), while ShipIt records SemVer (`5.0.0-rc.1`) in
 this file; the release script normalizes between them.
 
-## Unreleased
+## 5.0.0-rc.1 - 2026-04-20
+
+<strong><small>[View changes on Github](https://github.com/ReactiveX/RxPY/compare/8b59bc7394f1b6a8a78e2fc4b5efe200d4f47f89..2975deb528c9eec73c76cf8bb53fc8780f31de45)</small></strong>
 
 - Typing: Added `Action` and `StartableFactory` to `reactivex.typing.__all__`,
   making them part of the explicit public API surface.

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "reactivex"
-version = "0.0.0"
+version = "5.0.0rc1"
 description = "ReactiveX (Rx) for Python"
 authors = [{ name = "Dag Brattli", email = "dag@brattli.net" }]
 requires-python = ">= 3.10, < 4.0"

reactivex/_version.py

@@ -1 +1 @@
-__version__ = "0.0.0"  # NOTE: version will be written by ShipIt during release
+__version__ = "5.0.0rc1"