TASK: Add changelog for 8.3.15 [skip ci]

See https://jenkins.neos.io/job/flow-release/470/

Author: Jenkins

Neos.Flow/Documentation/TheDefinitiveGuide/PartV/ChangeLogs/8315.rst

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+`8.3.15 (2025-05-12) <https://github.com/neos/flow-development-collection/releases/tag/8.3.15>`_
+================================================================================================
+
+Overview of merged pull requests
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+`BUGFIX: Replace skip migrations with simple return <https://github.com/neos/flow-development-collection/pull/3477>`_
+---------------------------------------------------------------------------------------------------------------------
+
+If we use the skip migrations feature of doctrine, the migrations never get marked as applied. Which leads to situations, where your migration status will never be clean. So I replaced all skipif with a simple return.
+
+See also: https://github.com/doctrine/migrations/issues/1179
+
+* Packages: ``Flow``
+
+`BUGFIX: Accept node names starting with numbers in fizzle parser <https://github.com/neos/flow-development-collection/pull/3476>`_
+-----------------------------------------------------------------------------------------------------------------------------------
+
+* Resolves: `#3475 <https://github.com/neos/flow-development-collection/issues/3475>`_ 
+
+* Packages: ``Eel``
+
+`BUGFIX: Set property to null via objects yaml <https://github.com/neos/flow-development-collection/pull/3455>`_
+----------------------------------------------------------------------------------------------------------------
+
+This is probably similar to an ``autowiring: false`` option, but this does not exist as far as i debugged things for separate properties via objects yaml
+
+The idea was to have an optional object, which can be removed via settings
+
+```php
+#[Flow\\Inject]
+protected SomeService|null $someService = null;
+```
+
+```yaml
+Foo\\Bar\\Buz:
+  properties:
+    someService:
+      value: null
+```
+
+At the current state invalid php code is generated, see ``= ;`` which causes php to fail during parsing:
+
+```php
+if (\\Neos\\Utility\\ObjectAccess::setProperty($this, 'someService', ) === false) { $this->someService = ;}
+```
+
+**Upgrade instructions**
+
+
+* Packages: ``Flow``
+
+`Detailed log <https://github.com/neos/flow-development-collection/compare/8.3.14...8.3.15>`_
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~