🔖 prepare the v2.3 release (#414)

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## Description

This PR prepares the v2.3 release.

## Checklist:

<!---
This checklist serves as a reminder of a couple of things that ensure
your pull request will be merged swiftly.
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- [x] The pull request only contains commits that are focused and
relevant to this change.
- [x] I have updated the documentation to reflect these changes.
- [x] I have added entries to the changelog for any noteworthy
additions, changes, fixes, or removals.
- [x] I have added migration instructions to the upgrade guide (if
needed).
- [x] The changes follow the project's style guidelines and introduce no
new warnings.
- [x] The changes are fully tested and pass the CI checks.
- [x] I have reviewed my own code changes.

---------

Signed-off-by: Nils Quetschlich <[email protected]>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Lukas Burgholzer <[email protected]>

Author: 3 people

CHANGELOG.md

@@ -9,9 +9,14 @@ This project adheres to [Semantic Versioning], with the exception that minor rel
 
 ## [Unreleased]
 
+## [2.3.0] - 2025-07-29
+
+_If you are upgrading: please see [`UPGRADING.md`](UPGRADING.md#230)._
+
 ### Added
 
-- 📝 Added docstrings for raised errors for all methods ([#405]) ([**@nquetschlich**])
+- 📝 Add docstrings for raised errors for all methods ([#405]) ([**@nquetschlich**])
+- ✨ Add Estimated Hellinger Distance as a further Figure of Merit ([#360]) ([**@flowerthrower**])
 
 ### Changed
 
@@ -20,14 +25,16 @@ This project adheres to [Semantic Versioning], with the exception that minor rel
 - 📝 Migrate the documentation from .rst to .md files ([#403]) ([**@nquetschlich**])
 - ✨ Improve RL action handling by using dataclasses ([#401]) ([**@nquetschlich**])
 - ✨ Support MQT Bench v2 and use Qiskit's Target to represent quantum devices ([#393]) ([**@nquetschlich**])
+- 🚚 Move to MQT organization ([#385]) ([**@flowerthrower**])
 
 ## [2.2.0] - 2025-02-02
 
 _📚 Refer to the [GitHub Release Notes](https://github.com/munich-quantum-toolkit/predictor/releases) for previous changelogs._
 
 <!-- Version links -->
 
-[unreleased]: https://github.com/munich-quantum-toolkit/predictor/compare/v2.2.0...HEAD
+[unreleased]: https://github.com/munich-quantum-toolkit/predictor/compare/v2.3.0...HEAD
+[2.3.0]: https://github.com/munich-quantum-toolkit/predictor/compare/v2.2.0...v2.3.0
 [2.2.0]: https://github.com/munich-quantum-toolkit/predictor/releases/tag/v2.2.0
 
 <!-- PR links -->
@@ -37,11 +44,14 @@ _📚 Refer to the [GitHub Release Notes](https://github.com/munich-quantum-tool
 [#403]: https://github.com/munich-quantum-toolkit/predictor/pull/403
 [#401]: https://github.com/munich-quantum-toolkit/predictor/pull/401
 [#393]: https://github.com/munich-quantum-toolkit/predictor/pull/393
+[#385]: https://github.com/munich-quantum-toolkit/predictor/pull/385
+[#360]: https://github.com/munich-quantum-toolkit/predictor/pull/360
 
 <!-- Contributor -->
 
 [**@burgholzer**]: https://github.com/burgholzer
 [**@nquetschlich**]: https://github.com/nquetschlich
+[**@flowerthrower**]: https://github.com/flowerthrower
 
 <!-- General links -->
 

UPGRADING.md

@@ -4,6 +4,23 @@ This document describes breaking changes and how to upgrade. For a complete list
 
 ## [Unreleased]
 
+## [2.3.0] - 2025-07-29
+
+In this release, we have migrated to using Qiskit's `Target` class to represent quantum devices.
+This change allows for better compatibility with the latest MQT Bench version and improves the overall usability of the library.
+Beyond that, we also support Qiskit v2 now.
+
+Furthermore, both the ML and RL parts of MQT Predictor have been refactored to enhance their functionality and usability:
+The ML setup has been simplified and streamlined, making it easier to use and integrate into your workflows.
+The RL action handling has been updated to utilize dataclasses, which improves the structure and clarity of the code, making it easier to understand and maintain.
+
+### General
+
+MQT Bench has moved to the [munich-quantum-toolkit](https://github.com/munich-quantum-toolkit) GitHub organization under https://github.com/munich-quantum-toolkit/predictor.
+While most links should be automatically redirected, please update any links in your code to point to the new location.
+All links in the documentation have been updated accordingly.
+
 <!-- Version links -->
 
-[unreleased]: https://github.com/munich-quantum-toolkit/predictor/compare/v2.2.0...HEAD
+[unreleased]: https://github.com/munich-quantum-toolkit/predictor/compare/v2.3.0...HEAD
+[2.3.0]: https://github.com/munich-quantum-toolkit/predictor/compare/v2.2.0...v2.3.0