* 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

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

* 5.4:
  [Security] fix compat with security-core v6
  use proper methods to assert exception messages contain certain strings

* 5.4:
  CS fix
  Fix test provider

…oviders

* 5.4:
  [Translation][Mailer] Convert `$this` calls to static ones in data providers
  [BC Break] Make data providers for abstract test cases static
  use TestCase suffix for abstract tests in Tests directories
  Fix Request locale property doc types
  Bump absolute lowest dep to 4.4

…hat may cause unstable tests (alexandre-daubois)

This PR was merged into the 6.3 branch.

Discussion
----------

[Mailer][Translation] Remove some `static` occurrences that may cause unstable tests

| Q             | A
| ------------- | ---
| Branch?       | 6.3
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       | _NA_
| License       | MIT
| Doc PR        | _NA_

I had a little tchat with `@nicolas`-grekas who warned me that a few of my late edits on static data providers are a bit dangerous. Indeed, some helper methods were using static properties, which could lead to some leaks between test cases, and/or unstable tests.

Helper classes doing so, found in `Translation` and `Mailer`, have been reverted to non-static ones. Data-providers are of course still statics and have been adapted to not use those methods.

The targeted branch is 6.3 and this is intended, as requested by Nicolas. If you need any help during the backport of these edits, I'll be happy to help again!

ℹ️ A lot of notifier bridges has been introduced in 6.3 and their data providers weren't updated. I also bundled this change in the PR, which should fix 6.3 pipeline as well.

Finally, I updated `SmsapiTransportFactoryTest::missingRequiredOptionProvider`. As the `from` option has been made optional, the only dataset provided failed.

Commits
-------

2ca9cf8988 [Mailer][Translation][Notifier] Remove some `static` occurrences that may cause unstable tests

…hat may cause unstable tests (alexandre-daubois)

This PR was merged into the 6.3 branch.

Discussion
----------

[Mailer][Translation] Remove some `static` occurrences that may cause unstable tests

| Q             | A
| ------------- | ---
| Branch?       | 6.3
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       | _NA_
| License       | MIT
| Doc PR        | _NA_

I had a little tchat with `@nicolas`-grekas who warned me that a few of my late edits on static data providers are a bit dangerous. Indeed, some helper methods were using static properties, which could lead to some leaks between test cases, and/or unstable tests.

Helper classes doing so, found in `Translation` and `Mailer`, have been reverted to non-static ones. Data-providers are of course still statics and have been adapted to not use those methods.

The targeted branch is 6.3 and this is intended, as requested by Nicolas. If you need any help during the backport of these edits, I'll be happy to help again!

ℹ️ A lot of notifier bridges has been introduced in 6.3 and their data providers weren't updated. I also bundled this change in the PR, which should fix 6.3 pipeline as well.

Finally, I updated `SmsapiTransportFactoryTest::missingRequiredOptionProvider`. As the `from` option has been made optional, the only dataset provided failed.

Commits
-------

2ca9cf8988 [Mailer][Translation][Notifier] Remove some `static` occurrences that may cause unstable tests

* 5.4:
  Fix some Composer keywords
  [FrameworkBundle] Rename limiter’s `strategy` to `policy` in XSD
  [VarDumper] Fixed dumping of CutStub
  Fix test
  Change limit argument from string to integer.
  [Messenger] Fix `evaluate()` calls in `WorkerTest`
  [Mailer] STDOUT blocks infinitely under Windows when STDERR is filled