🔖 Prepare release of v3.3.0

[denialhaag]

Description

This PR prepares the release of v3.3.0.

Checklist:

• The pull request only contains commits that are focused and relevant to this change.
• I have added appropriate tests that cover the new/changed functionality.
• I have updated the documentation to reflect these changes.
• I have added entries to the changelog for any noteworthy additions, changes, fixes, or removals.
• I have added migration instructions to the upgrade guide (if needed).
• The changes follow the project's style guidelines and introduce no new warnings.
• The changes are fully tested and pass the CI checks.
• I have reviewed my own code changes.

Summary by CodeRabbit

• Changed

  • Bumped minimum supported core component to a newer required version.
  • Ended support for Python 3.9; testing and wheel distributions updated accordingly.

• Documentation

  • Added release notes and upgrading guidance for v3.3.0.
  • Updated changelog and version comparison links, including new PR reference.
  • Updated “Unreleased” links to point to v3.3.0.

[coderabbitai]

Caution

Review failed

The pull request is closed.

📝 Walkthrough

Walkthrough

Adds a 3.3.0 entry to release notes and upgrading guide: bumps minimum mqt-core to 3.3.1, declares Python 3.9 end-of-life, updates Unreleased/version comparison links to reference v3.3.0, and adds PR reference #735.

Changes

Cohort / File(s)	Summary
Docs: Changelog CHANGELOG.md	Add 3.3.0 release entry under Unreleased, bump minimum mqt-core to 3.3.1, add Upgrading note and PR #735, update Unreleased/version comparison links to v3.3.0.
Docs: Upgrading guide UPGRADING.md	Add 3.3.0 section stating Python 3.9 is no longer supported, update Unreleased link to v3.3.0...HEAD, and add v3.3.0 comparison link v3.2.0...v3.3.0.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

A rabbit tapped the release drum, hop-hop—3.3!
Notes tucked in the burrow, tidy as can be.
Farewell, 3.9—your carrots rotted free.
Core nudged forward, links hopped to see.
I thump and nibble docs—celebrate with me! 🥕🐇

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title Check	✅ Passed	The title concisely and accurately summarizes the primary change by indicating this PR prepares the v3.3.0 release, with no misleading or irrelevant content.
Description Check	✅ Passed	The PR description follows the repository’s template by including a ## Description section with a concise summary of the change and a ## Checklist that mirrors the template; the Fixes line is correctly omitted since no issue is being closed and no new dependencies apply.
Docstring Coverage	✅ Passed	No functions found in the changes. Docstring coverage check skipped.

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: ASSERTIVE

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between abeb308 and e707808.

📒 Files selected for processing (1)

• UPGRADING.md (2 hunks)

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_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[coderabbitai]

Actionable comments posted: 1

📜 Review details

Configuration used: CodeRabbit UI

Review profile: ASSERTIVE

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 3f23bfc and abeb308.

📒 Files selected for processing (2)

• CHANGELOG.md (2 hunks)
• UPGRADING.md (2 hunks)

🧰 Additional context used

🪛 LanguageTool

UPGRADING.md

[grammar] ~7-~7: Use correct spacing
Context: ...ANGELOG.md). ## [Unreleased] ## [3.3.0] ### End of support for Python 3.9 Starting ...

(QB_NEW_EN_OTHER_ERROR_IDS_5)

CHANGELOG.md

[grammar] ~12-~12: Use correct spacing
Context: ...## [Unreleased] ## [3.3.0] - 2025-10-14 _If you are upgrading: please see [`UPGRA...

(QB_NEW_EN_OTHER_ERROR_IDS_5)

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[grammar] ~14-~14: Use colons correctly
Context: ...] ## [3.3.0] - 2025-10-14 _If you are upgrading: please see [UPGRADING.md](UPGRADING.m...

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[grammar] ~14-~14: Use correct spacing
Context: ... see UPGRADING.md._ ### Added - 👷 Enable testing on Python 3.1...

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[grammar] ~16-~16: Use correct spacing
Context: ...DING.md`](UPGRADING.md#330)._ ### Added - 👷 Enable testing on Python 3.14 ([#730]...

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[grammar] ~18-~18: There might be a mistake here.
Context: ...Python 3.14 ([#730]) ([@denialhaag]) ### Changed - ⬆️ Bump minimum required `mqt...

(QB_NEW_EN)

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[grammar] ~20-~20: Use correct spacing
Context: ...[#730]) ([@denialhaag]) ### Changed - ⬆️ Bump minimum required mqt-core vers...

(QB_NEW_EN_OTHER_ERROR_IDS_5)

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[grammar] ~22-~22: Use correct spacing
Context: ... to 3.3.1 ([#735]) ([@denialhaag]) ### Removed - 🔥 Drop support for Python 3....

(QB_NEW_EN_OTHER_ERROR_IDS_5)

[burgholzer]

LGTM 👍🏼 Let's get this release out! 🚀