…alidator (fabpot)

This PR was merged into the 4.2-dev branch.

Discussion
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[Validator] Deprecate checkMX and checkHost on Email validator

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | no <!-- don't forget to update src/**/CHANGELOG.md files -->
| BC breaks?    | no     <!-- see https://symfony.com/bc -->
| Deprecations? | yes
| Tests pass?   | yes    <!-- please add some, will be required by reviewers -->
| Fixed tickets | fixes #27559 fixes #28665
| License       | MIT
| Doc PR        | symfony/symfony-docs#... <!-- required for new features -->

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Commits
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c6009a0 [Validator] deprecate checkMX and checkHost on Email validator