investigate an alternative to Pyminifier be found

[Josverl]

See : https://github.com/BradenM/micropy-cli/issues/279

[Josverl]

https://github.com/dflook/python-minifier Looks promising

[Josverl]

• Switched to minifiction using 'python-minifier'
• updated multiple tests
• updated the runtime IsMicropython test to improve minification
• tagged the Minification tests and run them after minification

fixed in version 1.4.1 : https://github.com/Josverl/micropython-stubber/commit/e1f4a3e670d88bd4b8e91daed2e61aa8b0248474