TASK: Add changelog for 8.3.15 [skip ci]

See https://jenkins.neos.io/job/neos-release/445/

Neos.Neos/Documentation/Appendixes/ChangeLogs/8315.rst

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+`8.3.15 (2024-06-14) <https://github.com/neos/neos-development-collection/releases/tag/8.3.15>`_
+================================================================================================
+
+Overview of merged pull requests
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+`BUGFIX: Access isNil function from Helper function to apply selected image to property <https://github.com/neos/neos-development-collection/pull/5140>`_
+---------------------------------------------------------------------------------------------------------------------------------------------------------
+
+**Upgrade instructions**
+
+_None_
+
+**Review instructions**
+
+Follow-up to: `#5117 <https://github.com/neos/neos-development-collection/issues/5117>`_
+
+With the latest Bugfix release of Neos 8.3.14 currently when selecting an image from the media browser it not will be applyied to the image property as the ``IsNil`` function has to be accessed inside of the ``Helper`` function.
+
+```javascript
+NeosCMS.isNil()
+```
+In this case, leads to an unresolved function or method.
+
+### Before
+
+https://github.com/neos/neos-development-collection/assets/39345336/ed761221-924d-467f-bd9f-6eb6c97dd553
+
+### After
+
+https://github.com/neos/neos-development-collection/assets/39345336/2c78211a-c8a8-4f55-808a-15b495fde586
+
+
+
+* Packages: ``Neos`` ``Media.Browser``
+
+`Detailed log <https://github.com/neos/neos-development-collection/compare/8.3.14...8.3.15>`_
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~