* 5.4:
  Remove usage of constant for better consistency across the codebase
  [HttpClient] Ensure HttplugClient ignores invalid HTTP headers

* 5.4:
  [Translation] Fix handling of null messages in `ArrayLoader`
  [Console] Remove exec and replace it by shell_exec

…the question helper is not blocking, the default value is always used as the stream return false. In order to fix that, we force the stream to be in blocking state and go back to the old state after so other logic is not impacted by this change

* 5.4:
  [5.4] Allow PhpUnitBridge v7
  [Console] block input stream if needed When the input stream used in the question helper is not blocking, the default value is always used as the stream return false. In order to fix that, we force the stream to be in blocking state and go back to the old state after so other logic is not impacted by this change

This PR was merged into the 5.4 branch.

Discussion
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[Console] Fix PHP Doc of InputArgument

| Q             | A
| ------------- | ---
| Branch?       | 5.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       |
| License       | MIT
| Doc PR        |

Commits
-------

f09d08c34c [Console] Fix PHP Doc of InputArgument

* 5.4:
  [Console] Fix PHP Doc of InputArgument