…transform (mttsch)

This PR was merged into the 7.3 branch.

Discussion
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[ObjectMapper] Fix parameter passed to class level transform

| Q             | A
| ------------- | ---
| Branch?       | 7.3
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Issues        | Fix symfony#60827
| License       | MIT

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Commits
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7a3c92f [ObjectMapper] Fix parameter passed to class level transform