Avoid removal warning in AnimatorFactory due to java-doc reference

[HannesWell]

Tonight's I-build failed with

[ERROR] Failed to execute goal org.eclipse.tycho:tycho-compiler-plugin:5.0.1-SNAPSHOT:compile (default-compile) on project org.eclipse.jface: Compilation failure: Compilation failure: 
[ERROR] /home/jenkins/agent/workspace/Builds/I-build-4.38/cje-production/gitCache/eclipse.platform.releng.aggregator/eclipse.platform.ui/bundles/org.eclipse.jface/src/org/eclipse/jface/dialogs/AnimatorFactory.java:[23] 
[ERROR] 	* {@link org.eclipse.jface.util.Policy#setAnimatorFactory(AnimatorFactory)}
[ERROR] 	                                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[ERROR] Javadoc: The method setAnimatorFactory(AnimatorFactory) from the type Policy is deprecated

This is an attempt to fix eclipse-platform/eclipse.platform.releng.aggregator#3464

[github-actions]

Test Results

 3 018 files  +1 006   3 018 suites  +1 006   2h 7m 40s ⏱️ + 52m 21s
 8 234 tests ±    0   7 985 ✅ ±    0  249 💤 ±  0  0 ❌ ±0 
23 622 runs  +7 874  22 828 ✅ +7 579  794 💤 +295  0 ❌ ±0 

Results for commit 1b959fa. ± Comparison against base commit 6f2025c.