* 5.4:
  Fix LICENSE CI check
  fixes retrieving multiple values for extra fields
  [String] Remove duplicates in fold maps
  fail with a meaningful error when a needed package is missing
  [DependencyInjection] Fix combinatory explosion when autowiring union and intersection types
  Update license years (last time)
  [Tests] New iteration of removing `$this` occurrences in future static data providers

…-daubois)

This PR was merged into the 5.4 branch.

Discussion
----------

[Tests] Migrate data providers to static ones

| Q             | A
| ------------- | ---
| Branch?       | 5.4
| Bug fix?      | yes-ish
| New feature?  | no
| Deprecations? | no
| Tickets       | Related to #48668
| License       | MIT
| Doc PR        | _NA_

Migrating data providers to static ones, based on the failing CI of symfony/symfony#48668

cc `@OskarStark` 👋

Commits
-------

36bc5ae37e [Tests] Migrate data providers to static ones

* 5.4:
  [Serializer] Fix CsvEncoder decode on empty data
  [Tests] Migrate data providers to static ones
  stop using assertObjectHasAttribute()/assertObjectHasNotAttribute()
  [Dotenv] Fix phpdoc Dotenv
  [Config] Fix phpdoc nullable
  Fix some typos

… `/Tests/` (OskarStark)

This PR was merged into the 6.3 branch.

Discussion
----------

[PHPUnit 10] Use `TestCase` suffix for abstract tests in `/Tests/`

| Q             | A
| ------------- | ---
| Branch?       | 6.3
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       | Refs symfony/symfony#49233
| License       | MIT
| Doc PR        | n/a

Replaces #49234

Using `Test` suffix is deprecated since PHPUnit 10

Spotted in
* symfony/symfony#49233

Commits
-------

cb3db968e4 [PHPUnit 10] Use `TestCase` suffix for abstract tests in `/Tests/`

* 5.4:
  minor #49253 [PHPUnit 10] Use `TestCase` suffix for abstract tests in `/Tests/` (OskarStark)

* 5.4:
  [FrameworkBundle] Improve error message in MicroKernelTrait when using deprecated configureRoutes(RouteCollectionBuilder) with symfony/routing >= 6.0
  Add warning about Symfony 5.2 changing pcntl_async_signals
  [Tests] Fix static calls and Mock var annotation
  [FrameworkBundle] Fix checkboxes check assertions
  [Notifier][WebProfilerBundle] Ignore messages whose `getNotification` returns `null`
  [HttpClient] Fix over-encoding of URL parts to match browser's behavior
  Fix Psalm job
  [HttpClient] Fix data collector
  [Tests] Migrate tests to static data providers
  [Semaphore] Fix test
  Fix: Split and clean up tests
  Remove unused data provider
  add Sender to the list of bypassed headers

* 5.4:
  Migrate to `static` data providers using `rector/rector`

* 5.4:
  [Tests] Replace `setMethods()` by `onlyMethods()` and `addMethods()`

* 5.4:
  Avoid call on null
  [Notifier] Document Firebase options object in readme
  [ErrorHandler] Fix sending Vary header with SerializerErrorRenderer
  Fix intl data tests
  [DoctrineBridge] fix issue with missing stopwatch events
  [HttpClient] Fix canceling MockResponse