Update megalinter.yml

[leeter]

disable VALIDATE_ALL_CODEBASE because this is a small project and the errors aren't useful if it always fails

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ COPYPASTE	jscpd	yes		no	1.99s
✅ REPOSITORY	dustilock	yes		no	0.05s
✅ REPOSITORY	gitleaks	yes		no	0.63s
✅ REPOSITORY	git_diff	yes		no	0.04s
✅ REPOSITORY	grype	yes		no	10.04s
✅ REPOSITORY	secretlint	yes		no	0.99s
✅ REPOSITORY	syft	yes		no	0.28s
✅ REPOSITORY	trivy	yes		no	4.81s
✅ REPOSITORY	trivy-sbom	yes		no	3.3s
✅ REPOSITORY	trufflehog	yes		no	4.02s

See detailed report in MegaLinter reports
Set VALIDATE_ALL_CODEBASE: true in mega-linter.yml to validate all sources, not only the diff

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