* 3.4:
  [VarDumper] fix for change in PHP 7.4.6 (bis)
  [BrowserKit] Allow Referer set by history to be overridden (3.4)

* 4.4:
  [VarDumper] fix for change in PHP 7.4.6 (bis)
  [VarExporter] fix for change in PHP 7.4.6
  [BrowserKit] Allow Referer set by history to be overridden (3.4)

* 4.4:
  [PhpUnitBridge] fix leftover
  [PhpUnitBridge] fix installing under PHP >= 8
  Use ">=" for the "php" requirement
  bump icu 67.1

…urb)

This PR was squashed before being merged into the 4.4 branch.

Discussion
----------

[BrowserKit] Raw body with custom Content-Type header

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| License       | MIT

Currently, if you try to send POST/PUT request with custom `Content-Type` header and specified body, the real request will contain `text/plain` content type.

Following code
```php
$client->request(
    'POST',
    '/url',
    [],
    [],
    [
        'CONTENT_TYPE' => 'application/json'
    ],
    '{"foo":"bar"}'
);
```
produces next request
```
POST /
Content-Type: text/plain; charset=utf-8

{"foo":"bar"}
```

With this fix, the request will be
```
POST /
Content-Type: application/json

{"foo":"bar"}
```

Commits
-------

d2dd92be77 [BrowserKit] Raw body with custom Content-Type header

* 4.4: (27 commits)
  [Serializer] minor cleanup
  fix merge
  Run PHP 8 as 7.4.99
  Remove calls to deprecated ReflectionParameter::getClass().
  [VarDumper] fix PHP 8 support
  Add php 8 to travis.
  [Cache] Accessing undefined constants raises an Error in php8
  [Cache] allow DBAL v3
  Skip Doctrine DBAL on php 8 until we have a compatible version.
  [DomCrawler] Catch expected ValueError.
  Made method signatures compatible with their corresponding traits.
  [ErrorHandler] Apply php8 fixes from Debug component.
  [DomCrawler] Catch expected ValueError.
  [Validator] Catch expected ValueError.
  [VarDumper] ReflectionFunction::isDisabled() is deprecated.
  [BrowserKit] Raw body with custom Content-Type header
  [PropertyAccess] Parse php 8 TypeErrors correctly.
  [Intl] Fix call to ReflectionProperty::getValue() for static properties.
  [HttpKernel] Prevent calling method_exists() with non-string values.
  Fix wrong roles comparison
  ...