ci: replace PHP 8.2 with PHP 8.4 in the PHPUnit matrix

[bigcat88]

The PHPUnit workflow runs its matrix against Nextcloud server master, which recently raised its minimum to PHP 8.3, so the old PHP 8.2 leg fails before any test runs (maintenance:install aborts with "requires at least PHP 8.3").

Instead of just dropping 8.2, this adds PHP 8.4 alongside 8.3: the matrix now runs PHP 8.3 and 8.4 against server master. That keeps two-version coverage and tests against the newest PHP that master supports.

Lint jobs and the 8.2 min-version in info.xml are left as-is, since AppAPI still runs on 8.2 under older Nextcloud releases; only the master-branch PHPUnit job needs a PHP the server accepts.

[coderabbitai]

📝 Walkthrough

Walkthrough

The PHPUnit GitHub Actions workflow matrix is updated to remove PHP 8.2 and add PHP 8.4, resulting in a test matrix of ['8.3', '8.4']. This single-line change in .github/workflows/phpunit.yml adjusts which PHP versions the workflow tests against; no other workflow steps, jobs, or configuration are modified.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title accurately describes the main change: replacing PHP 8.2 with PHP 8.4 in the PHPUnit workflow matrix, which is the primary modification in the changeset.
Description check	✅ Passed	The description is directly related to the changeset, providing context about why PHP 8.2 was replaced (Nextcloud server master's new PHP 8.3 minimum requirement) and explaining the decision to add PHP 8.4.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

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[coderabbitai]

Actionable comments posted: 1

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: df1bbc58-f61a-4c01-8a43-784a7b291a29

📥 Commits

Reviewing files that changed from the base of the PR and between e040005 and 0f89f4a.

📒 Files selected for processing (1)

• .github/workflows/phpunit.yml