bug #36751 [Mime] fix bad method call on EmailAddressContains (Kocal)

This PR was merged into the 4.4 branch.

Discussion
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[Mime] fix bad method call on `EmailAddressContains`

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | yes
| New feature?  | no <!-- please update src/**/CHANGELOG.md files -->
| Deprecations? | no <!-- please update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Tickets       | -
| License       | MIT
| Doc PR        | -

There is no method `Address` on [`MailboxHeader`](https://github.com/symfony/symfony/blob/4.4/src/Symfony/Component/Mime/Header/MailboxHeader.php), but a method `getAddress`.

Commits
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227ebd2 [Mime] fix bad method call on "EmailAddressContains"

src/Symfony/Component/Mime/Test/Constraint/EmailAddressContains.php

@@ -48,7 +48,7 @@ protected function matches($message): bool
 
         $header = $message->getHeaders()->get($this->headerName);
         if ($header instanceof MailboxHeader) {
-            return $this->expectedValue === $header->Address()->getAddress();
+            return $this->expectedValue === $header->getAddress()->getAddress();
         } elseif ($header instanceof MailboxListHeader) {
             foreach ($header->getAddresses() as $address) {
                 if ($this->expectedValue === $address->getAddress()) {