TASK: Add changelog for 7.3.19 [skip ci]

See https://jenkins.neos.io/job/flow-release/442/

Author: Jenkins

Neos.Flow/Documentation/TheDefinitiveGuide/PartV/ChangeLogs/7319.rst

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+`7.3.19 (2024-02-23) <https://github.com/neos/flow-development-collection/releases/tag/7.3.19>`_
+================================================================================================
+
+Overview of merged pull requests
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+`BUGFIX: Dont log stack trace for `InvalidHashException` in Production <https://github.com/neos/flow-development-collection/pull/3247>`_
+----------------------------------------------------------------------------------------------------------------------------------------
+
+This configures an ``invalidHashExceptions`` exception handler rendering group and configures it to not dump stack traces in ``Production`` context. For ``Development`` context stack traces are still written to ease debugging.
+
+* See: `#3159 <https://github.com/neos/flow-development-collection/issues/3159>`_
+
+**Upgrade instructions**
+
+In case you need trace dumps for ``InvalidHashException`` in production context, override the settings as needed.
+
+**Review instructions**
+
+* See: `#3159 <https://github.com/neos/flow-development-collection/issues/3159>`_ for ways to trigger those exceptions. Then check if a trace is dumped.
+
+
+* Packages: ``Flow``
+
+`BUGFIX: Fix documentation of `maximumThrowableDump` defaults <https://github.com/neos/flow-development-collection/pull/3269>`_
+-------------------------------------------------------------------------------------------------------------------------------
+
+* Related: `#3158 <https://github.com/neos/flow-development-collection/issues/3158>`_
+
+* Packages: ``Flow``
+
+`TASK: Scripts.php avoid use of same references for exec <https://github.com/neos/flow-development-collection/pull/3171>`_
+--------------------------------------------------------------------------------------------------------------------------
+
+Followup to https://github.com/neos/flow-development-collection/pull/3116
+
+I debugged with @dlubitz a problem and we found that in theory?  $output _might_ be possibly already filled?
+I dont know if that can happen but just to be sure we set it to empty as its also a bad practice.
+
+
+**Upgrade instructions**
+
+**Review instructions**
+
+
+* Packages: ``Flow``
+
+`TASK: Fix errors in Middleware code example <https://github.com/neos/flow-development-collection/pull/3299>`_
+--------------------------------------------------------------------------------------------------------------
+
+I found two small errors in the Middleware code example in the documentation.
+
+
+* Packages: ``Flow``
+
+`Detailed log <https://github.com/neos/flow-development-collection/compare/7.3.18...7.3.19>`_
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~