This PR was squashed before being merged into the 4.3-dev branch (closes #30482).

Discussion
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[Mime] Fix support for date form parts

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

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Commits
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5c8a4e3 [Mime] removed the 2 parts constraints on Multipart (not true for DataFormPart for instance)
0450c4f [Mime] fixed support for date form parts