Downgrade Pyoxidizer from 0.24.0 to 0.23.0

Unfortunately it seems that multiple people in the community are
struggling to build from source after we upgraded to the latest
version of Pyoxidizer (same issue as
 #37)

This seems to be a known issue in the project
indygreg/PyOxidizer#673.

The nature of this problem comes from our over-reliance on 3rd-party
dependencies to package the Microkit tool. We will most likely
encounter further issues as we are compiling an interpreted language.

However, even if we were to switch to a compile time langauge (e.g
Rust) we would still have problems as the Rust compiler is not
isolated.

Signed-off-by: Ivan Velickovic <[email protected]>

requirements.txt

@@ -3,7 +3,7 @@
 #
 # SPDX-License-Identifier: BSD-2-Clause
 #
-pyoxidizer==0.24.0
+pyoxidizer==0.23.0
 mypy==0.910
 black==21.7b0
 flake8==3.9.2