…er() (HeahDude)

This PR was merged into the 5.0 branch.

Discussion
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[DoctrineBridge] Removed QueryBuilder type hint in getLoader()

| Q             | A
| ------------- | ---
| Branch?       | 5.0 <!-- see below -->
| Bug fix?      | yes
| New feature?  | no <!-- please update src/**/CHANGELOG.md files -->
| Deprecations? | no <!-- please update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Tickets       | ~
| License       | MIT
| Doc PR        | ~
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Follows #34600.

Commits
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8621852 [DoctrineBridge] Removed QueryBuilder type hint in getLoader()