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

Discussion
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[Console] Escape synopsis output

| 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       | Fix #41315 <!-- prefix each issue number with "Fix #", no need to create an issue if none exist, explain below instead -->
| License       | MIT
| Doc PR        | symfony/symfony-docs#... <!-- required for new features -->

Commits
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960cb520df [Console] Escape synopsis output

* 4.4:
  [Console] Escape synopsis output
  Document null support in NumberToLocalizedStringTransformer

Signed-off-by: Alexander M. Turek <[email protected]>

* 4.4:
  Fix incompatible implicit float-to-int conversions
  [Translation] Don't pass null to strtoupper()
  cs fix
  [DependencyInjection] Don't pass null to trim()
  Add return types to JsonSerializable implementations
  Fix Serializable deprecations triggered by token mocks
  Add missing security translations