TASK: Add changelog for 8.3.20 [skip ci]

See https://jenkins.neos.io/job/neos-release/458/

Neos.Neos/Documentation/Appendixes/ChangeLogs/8320.rst

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+`8.3.20 (2025-01-27) <https://github.com/neos/neos-development-collection/releases/tag/8.3.20>`_
+================================================================================================
+
+Overview of merged pull requests
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+`BUGFIX: fix error during site import <https://github.com/neos/neos-development-collection/pull/5449>`_
+-------------------------------------------------------------------------------------------------------
+
+This adjusts the annotation to work with Flow 8.3.13  ... before the type with spaces was interpreted as ``mixed`` and caused the following error during site:import.
+
+```
+During the import of the "Sites.xml" from the package "Neos.Demo" an exception occurred: Error: During import an exception occurred: "Could not convert target type "Neos\\Media\\Domain\\Model\\ImageVariant": Could not convert target type "Neos\\Media\\Domain\\Model\\Adjustment\\CropImageAdjustment", at property path "aspectRatio": Could not find a suitable type converter for "mixed" because the class / interface "mixed" does not exist."., see log for further information.
+```
+
+* Resolves: `#5448 <https://github.com/neos/neos-development-collection/issues/5448>`_
+
+**Review instructions**
+
+The new behavior was introduced to flow with pr: https://github.com/neos/flow-development-collection/pull/3424
+
+
+* Packages: ``Neos`` ``Media``
+
+`TASK: Check if index need to be renamed <https://github.com/neos/neos-development-collection/pull/5446>`_
+----------------------------------------------------------------------------------------------------------
+
+In some instances the index is already renamed. This PR adds a check if this is the case and skips the migration in these cases.
+
+resolves `#5445 <https://github.com/neos/neos-development-collection/issues/5445>`_
+
+* Packages: ``Neos`` ``ContentRepository``
+
+`Detailed log <https://github.com/neos/neos-development-collection/compare/8.3.19...8.3.20>`_
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~