Fix python bandit config file use + count errors + black install

[nvuillam]

Fixes #679

Fixes #680

Fixes #681

[nvuillam]

Mega-Linter status: ⚠️ WARNING

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ BASH	bash-exec	6		0	0.27s
✅ BASH	shellcheck	6		0	0.55s
✅ BASH	shfmt	6	0	0	0.3s
✅ COPYPASTE	jscpd	yes		no	2.37s
✅ CREDENTIALS	secretlint	yes		no	3.91s
✅ CSS	stylelint	1	0	0	1.2s
✅ DOCKERFILE	dockerfilelint	1		0	0.29s
✅ DOCKERFILE	hadolint	1		0	1.38s
✅ GIT	git_diff	yes		no	0.03s
✅ JSON	eslint-plugin-jsonc	19	0	0	4.82s
✅ JSON	jsonlint	19		0	5.99s
✅ JSON	v8r	19		0	14.0s
✅ MARKDOWN	markdownlint	191	0	0	4.15s
✅ MARKDOWN	markdown-link-check	191		0	88.72s
✅ MARKDOWN	markdown-table-formatter	191	0	0	4.09s
✅ OPENAPI	spectral	1		0	1.34s
⚠️ PYTHON	bandit	137		60	2.38s
✅ PYTHON	black	137	0	0	37.94s
✅ PYTHON	flake8	137		0	2.54s
✅ PYTHON	isort	137	0	0	0.38s
✅ PYTHON	mypy	137		0	63.97s
✅ PYTHON	pylint	137		0	12.88s
✅ SPELL	cspell	469		0	43.11s
✅ SPELL	misspell	318	0	0	0.33s
✅ XML	xmllint	2		0	0.13s
✅ YAML	prettier	89	0	0	50.83s
✅ YAML	v8r	33		0	34.95s
✅ YAML	yamllint	90		0	14.07s

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[codecov-commenter]

Codecov Report

Merging #682 (ae42500) into master (ad0cf3c) will increase coverage by 0.06%.
The diff coverage is n/a.

❗ Current head ae42500 differs from pull request most recent head 62200ed. Consider uploading reports for the commit 62200ed to get more accurate results

@@            Coverage Diff             @@
##           master     #682      +/-   ##
==========================================
+ Coverage   87.03%   87.09%   +0.06%     
==========================================
  Files         132      132              
  Lines        3085     3085              
==========================================
+ Hits         2685     2687       +2     
+ Misses        400      398       -2     

Impacted Files	Coverage Δ
megalinter/MegaLinter.py	87.97% <0.00%> (+0.31%)	⬆️
megalinter/reporters/UpdatedSourcesReporter.py	89.18% <0.00%> (+2.70%)	⬆️

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