minor symfony#59380 [Mailer] Add missing retry_period DSN option (alamirault)

This PR was merged into the 7.3 branch.

Discussion
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[Mailer] Add missing `retry_period` DSN option

| Q             | A
| ------------- | ---
| Branch?       | 7.3
| Bug fix?      | no
| New feature?  | no <!-- please update src/**/CHANGELOG.md files -->
| Deprecations? | no <!-- please update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Issues        | Fix #... <!-- prefix each issue number with "Fix #", no need to create an issue if none exists, explain below instead -->
| License       | MIT

I found changelog is missing while documenting symfony/symfony-docs#20511

Code PR: symfony#54939

Commits
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2512b64 [Mailer] Add missing retry_period DSN option

Author: nicolas-grekas

src/Symfony/Component/Mailer/CHANGELOG.md

@@ -1,6 +1,11 @@
 CHANGELOG
 =========
 
+7.3
+---
+
+ * Add DSN param `retry_period` to override default email transport retry period
+
 7.2
 ---