minor #19538 [Yaml] update changelog and upgrade files (xabbuh)
minor #19538 [Yaml] update changelog and upgrade files (xabbuh)

This PR was merged into the 3.2-dev branch.

Discussion
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[Yaml] update changelog and upgrade files

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #19504
| License       | MIT
| Doc PR        |

Commits
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3cd2932 [Yaml] update changelog and upgrade files

symfony/yaml,symfony/Yaml,gencer/Yaml