Updated MinGW Python version (#9400)

Author: hugovk

docs/installation/platform-support.rst

@@ -57,7 +57,7 @@ These platforms are built and tested for every change.
 | Windows Server 2025              | 3.11, 3.12, 3.13, 3.14,    | x86-64              |
 |                                  | PyPy3                      |                     |
 |                                  +----------------------------+---------------------+
-|                                  | 3.12 (MinGW)               | x86-64              |
+|                                  | 3.13 (MinGW)               | x86-64              |
 +----------------------------------+----------------------------+---------------------+