TASK: Add changelog for 8.3.12 [skip ci]

See https://jenkins.neos.io/job/flow-release/457/

Neos.Flow/Documentation/TheDefinitiveGuide/PartV/ChangeLogs/8312.rst

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+`8.3.12 (2024-11-18) <https://github.com/neos/flow-development-collection/releases/tag/8.3.12>`_
+================================================================================================
+
+Overview of merged pull requests
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+`BUGFIX: Fix unit test for changed logging <https://github.com/neos/flow-development-collection/pull/3409>`_
+------------------------------------------------------------------------------------------------------------
+
+* See: `#3408 <https://github.com/neos/flow-development-collection/issues/3408>`_
+
+* Packages: ``Flow`` ``Flow.Log``
+
+`BUGFIX: Always add space between IP and severity in file logs <https://github.com/neos/flow-development-collection/pull/3408>`_
+--------------------------------------------------------------------------------------------------------------------------------
+
+For all IP addresses of length 15 or longer (most ipv6 addresses) no space was added between the IP address and the Severity.
+
+This bugfix always adds a space character between IP and severity.
+
+**Review instructions**
+
+Check if IPv6 addresses are separated with a space in log files.
+
+
+* Packages: ``Flow`` ``Flow.Log``
+
+`TASK: Use `SCAN` for redis flush <https://github.com/neos/flow-development-collection/pull/3387>`_
+---------------------------------------------------------------------------------------------------
+
+This should speed up flush operations and lower the load on Redis.
+
+**Review instructions**
+
+The functional tests run ``flush()``…
+
+
+* Packages: ``Cache``
+
+`TASK: Drop code for PHP < 8 <https://github.com/neos/flow-development-collection/pull/3412>`_
+----------------------------------------------------------------------------------------------
+
+This drops code that was only executed on PHP < 8.0, and thus will never ever be run again.
+
+* Packages: ``Flow``
+
+`Detailed log <https://github.com/neos/flow-development-collection/compare/8.3.11...8.3.12>`_
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~