make files more readable, update actions/checkout to v4 and setup-python to v5 and add bandit scan

[Killpit]

Changes made

-Changed actions/checkout from v3 to v4 to make sure the environment is kept on date
-Changed actions/setup-python from v4 to v5 to make sure the environment is kept on date
-Gave one more line each to make sure the pipeline lines on CI are more readable

Additions

-Added Bandit for GitHub Actions to find common security issues in Python code before it finds production, currently learning the tool and will try to figure out how I can fail if certain levels of security vulnerabilities (ie. high) are found.

Future plans

-Adding Safety for vulnerability scanning in packages, however, depending on the plan used, it can go up to $30 per month per developer
-Encompassing Bandit scan to stop the ci as soon as a certain level and certain confidence for vulnerability is found (such as high vulnerability high confidence).