minor #39824 No patch version in CHANGELOG (OskarStark)

This PR was merged into the 5.3-dev branch.

Discussion
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No patch version in CHANGELOG

| Q             | A
| ------------- | ---
| Branch?       | 5.x
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       | ---
| License       | MIT
| Doc PR        | ---

Based on symfony/symfony-docs#14830

cc @fabpot, feel free to close, as we discussed this already via Slack

Commits
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575d9b04b4 No patch version in CHANGELOG

Author: fabpot

CHANGELOG.md

@@ -1,8 +1,8 @@
 CHANGELOG
 =========
 
-5.3.0
------
+5.3
+---
 
  * The bridge is not marked as `@experimental` anymore
  * [BC BREAK] Change signature of `MattermostTransport::__construct()` method from: