Fix action + update test case

[nvuillam]

• Set outputrepo as not required in the GitHub Action definition
• Test case: check update of README file with Used by badge

[github-actions[bot]]

🦙 MegaLinter status: ⚠️ WARNING

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
⚠️ ACTION	actionlint	4		3	0.04s
✅ COPYPASTE	jscpd	yes		no	2.09s
⚠️ DOCKERFILE	hadolint	2		1	0.1s
✅ JSON	eslint-plugin-jsonc	3	0	0	1.54s
✅ JSON	jsonlint	3		0	0.22s
✅ JSON	prettier	3	0	0	0.74s
✅ JSON	v8r	3		0	4.1s
⚠️ MAKEFILE	checkmake	1		1	0.0s
⚠️ MARKDOWN	markdownlint	12	0	18	1.59s
✅ MARKDOWN	markdown-table-formatter	12	0	0	0.36s
✅ PYTHON	bandit	6		0	1.19s
✅ PYTHON	black	6	0	0	1.09s
✅ PYTHON	flake8	6		0	0.61s
✅ PYTHON	isort	6	0	0	0.33s
⚠️ PYTHON	mypy	6		5	8.27s
✅ PYTHON	pylint	6		0	4.97s
⚠️ PYTHON	pyright	6		8	10.4s
✅ PYTHON	ruff	6	0	0	0.03s
✅ REPOSITORY	checkov	yes		no	12.33s
✅ REPOSITORY	gitleaks	yes		no	2.51s
✅ REPOSITORY	git_diff	yes		no	0.03s
✅ REPOSITORY	grype	yes		no	11.9s
✅ REPOSITORY	secretlint	yes		no	1.11s
✅ REPOSITORY	trivy	yes		no	5.86s
✅ REPOSITORY	trivy-sbom	yes		no	2.74s
✅ REPOSITORY	trufflehog	yes		no	4.55s
✅ SPELL	cspell	47		0	5.29s
✅ SPELL	lychee	29		0	1.4s
✅ YAML	prettier	14	0	0	1.36s
✅ YAML	v8r	14		0	17.98s
✅ YAML	yamllint	14		0	0.44s

See detailed report in MegaLinter reports

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