Review DLLs bundled by `pyqt-bundle`

[philthompson10]

Currently pyqt-bundle bundles DLLs for OpenSSL, the C++ runtime and the C runtime. These should be reviewed to see if they are all still required. The following points need to be taken into account...

• Qt5 still needs to be supported
• all supported versions of Python include the C runtime (but are they accessible by the Qt DLLs?)
• the recommendation for C++ extension modules is that they dynamically link the C runtime and statically link the C++ runtime (however it's not clear how to do this, and the Qt DLLs probably dynamically link the C++ runtime anyway).

[philthompson10]

The OpenSSL DLLs are only required for Qt5 and Qt6 prior to v6.2.0 so they still need to be bundled but don't need to be updated and are not required for Windows on ARM.