[TASK] Update TYPO3 CMS to v14 (major)

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
typo3/cms-core (source)	~13.4.0 → ~13.4.0 || ~14.3.0
typo3/cms-extbase (source)	~13.4.0 → ~13.4.0 || ~14.3.0

---

Configuration

📅 Schedule: (UTC)

• Branch creation
  • Monday through Friday (* * * * 1-5)
• Automerge
  • At any time (no schedule defined)

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about these updates again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.

[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: composer.lock

Command failed: composer update typo3/cms-core:14.3.0 typo3/cms-extbase:14.3.0 --with-dependencies --ignore-platform-req ext-intl --no-ansi --no-interaction --no-scripts --no-autoloader --no-plugins --minimal-changes
Loading composer repositories with package information
Dependency psr/event-dispatcher is also a root requirement. Package has not been listed as an update argument, so keeping locked at old version. Use --with-all-dependencies (-W) to include root dependencies.
Dependency psr/http-message is also a root requirement. Package has not been listed as an update argument, so keeping locked at old version. Use --with-all-dependencies (-W) to include root dependencies.
Updating dependencies
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Root composer.json requires typo3/cms-core ~13.4.0 || ~14.3.0, found typo3/cms-core[v13.4.0, ..., v13.4.28, v14.3.0] but these were not loaded, likely because it conflicts with another require.
  Problem 2
    - Root composer.json requires typo3/cms-extbase ~13.4.0 || ~14.3.0, found typo3/cms-extbase[v13.4.0, ..., v13.4.28, v14.3.0] but these were not loaded, likely because it conflicts with another require.
  Problem 3
    - typo3/testing-framework is locked to version 9.5.0 and an update of this package was not requested.
    - typo3/testing-framework 9.5.0 requires typo3/cms-core 13.*.*@dev || 14.*.*@dev -> found typo3/cms-core[v13.0.0, ..., v13.4.28, v14.0.0, ..., v14.3.0] but these were not loaded, likely because it conflicts with another require.

Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.