…phanie)

This PR was merged into the 5.4 branch.

Discussion
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[Mailer][Notifier] Update Sendinblue / Brevo API host

| Q             | A
| ------------- | ---
| Branch?       | 5.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Issues        | Fix #52264
| License       | MIT

Sendinblue rebrands to Brevo, and it simultaneously upgrade smtp and API servers.
There are 2 distincts API currently : api.sendinblue.com (deprecated but still running) and api.brevo.com (the one to use)
Unlike SMTP host, API host is not changed on LTS 5.4 and are still set to api.sendinblue.com.

Commits
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554e9cc [Mailer] [Notifier] #52264 Update Sendinblue / Brevo API host

* 5.4:
  fix tests on AppVeyor
  Hungarian typo fix in validators translation
  [Validator] updated Latvian translation
  [Validator] Added missing Swedish translations
  [Mailer] [Notifier] #52264 Update Sendinblue / Brevo API host
  [Validator] Added missing Estonian translations #51939
  fix File constraint tests on 32bit PHP
  [Form] Skip merging params & files if there are no files in the first place
  [Translation] Ignore bridges in `.gitattributes` file
  Add missing Hungarian validator translations
  Added missing Bosnian translations #51929
  Added missing Serbian (sr_Latn) translations
  Added missing Serbian (sr_Cyrl) translations
  Hide generated files in GitHub diffs and statistics
  #51937 - Added missing Danish translations

* 6.3:
  fix tests on AppVeyor
  Hungarian typo fix in validators translation
  [Validator] updated Latvian translation
  [Validator] Added missing Swedish translations
  [Mailer] [Notifier] #52264 Update Sendinblue / Brevo API host
  [Validator] Added missing Estonian translations #51939
  fix File constraint tests on 32bit PHP
  [Form] Skip merging params & files if there are no files in the first place
  [Translation] Ignore bridges in `.gitattributes` file
  Add missing Hungarian validator translations
  Added missing Bosnian translations #51929
  Added missing Serbian (sr_Latn) translations
  Added missing Serbian (sr_Cyrl) translations
  Bump Symfony version to 6.3.7
  Update VERSION for 6.3.6
  Update CHANGELOG for 6.3.6
  Hide generated files in GitHub diffs and statistics
  #51937 - Added missing Danish translations

* 6.4: (31 commits)
  [Messenger] Add call to `gc_collect_cycles()` after each message is handled
  fix tests
  fix tests on AppVeyor
  Hungarian typo fix in validators translation
  [VarDump] Fix order of dumped properties - parent goes first
  DX: drop unused import
  [Validator] updated Latvian translation
  re-introduce conflict rule with WebProfilerBundle < 6.4
  [Validator] Added missing Swedish translations
  [Mailer] [Notifier] #52264 Update Sendinblue / Brevo API host
  [Validator] Added missing Estonian translations #51939
  fix File constraint tests on 32bit PHP
  [Form] Skip merging params & files if there are no files in the first place
  [Translation] Ignore bridges in `.gitattributes` file
  [AssetMapper] Adding import-parsing case where import contains a path
  Add missing Hungarian validator translations
  Added missing Bosnian translations #51929
  add return type hints to EntityFactory
  Update UndefinedCallableHandler with "importmap", "form" and "worflow" filters/functions
  [FrameworkBundle] Fix CommandDataCollector is always registered
  ...