Modernize dependabot.yml in correct directories

[echoix]

Allows to also specifically ignore some security flagging of a package.json designed for a vulnerability scanner (grype).

Proposed Changes

1. Sets the npm directory from a non existent dependencies folder to /mega-linter-runner, where the npm deps are
2. Adds the server folder as a directory where there are some python dependencies to check
3. Adds the megalinter folder as directory where there are some python dependencies to check, that will function correctly when the project will convert to pyproject.toml instead of setup.py
4. Adds the folder .config/python/dev as a folder for python.
5. We don't have gemfiles, but we don't have a dependencies folder too.

Readiness Checklist

Author/Contributor

• Add entry to the CHANGELOG listing the change and linking to the corresponding issue (if appropriate)
• If documentation is needed for this change, has that been included in this pull request

Reviewing Maintainer

• Label as breaking if this is a large fundamental change
• Label as either automation, bug, documentation, enhancement, infrastructure, or performance

[github-actions]

🦙 MegaLinter status: ⚠️ WARNING

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ BASH	bash-exec	5		0	0.08s
✅ BASH	shellcheck	5		0	0.11s
✅ BASH	shfmt	5	0	0	0.07s
✅ COPYPASTE	jscpd	yes		no	4.05s
✅ DOCKERFILE	hadolint	124		0	21.08s
✅ JSON	eslint-plugin-jsonc	23	0	0	2.39s
✅ JSON	jsonlint	21		0	0.27s
✅ JSON	v8r	23		0	17.04s
✅ MAKEFILE	checkmake	1		0	0.0s
⚠️ MARKDOWN	markdownlint	255	0	11	6.51s
✅ MARKDOWN	markdown-link-check	255		0	7.5s
✅ MARKDOWN	markdown-table-formatter	255	0	0	46.47s
✅ OPENAPI	spectral	1		0	1.74s
⚠️ PYTHON	bandit	201		61	2.85s
✅ PYTHON	black	201	0	0	5.87s
✅ PYTHON	flake8	201		0	2.57s
✅ PYTHON	isort	201	0	0	0.56s
✅ PYTHON	mypy	201		0	12.83s
✅ PYTHON	pylint	201		0	15.82s
⚠️ PYTHON	pyright	201		352	25.51s
✅ PYTHON	ruff	201	0	0	0.14s
✅ REPOSITORY	checkov	yes		no	46.72s
✅ REPOSITORY	git_diff	yes		no	0.06s
⚠️ REPOSITORY	grype	yes		1	11.61s
✅ REPOSITORY	secretlint	yes		no	12.5s
✅ REPOSITORY	trivy	yes		no	31.24s
✅ REPOSITORY	trivy-sbom	yes		no	1.5s
⚠️ REPOSITORY	trufflehog	yes		1	24.53s
✅ SPELL	cspell	667		0	30.78s
✅ SPELL	lychee	335		0	4.2s
✅ XML	xmllint	3	0	0	0.06s
✅ YAML	prettier	160	0	0	5.79s
✅ YAML	v8r	102		0	211.28s
✅ YAML	yamllint	161		0	1.87s

See detailed report in MegaLinter reports

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[nvuillam]

Great ❤️