ci: update contribution agreement

[margaretjgu]

combatting vibecoded slop spam arghhhhhhhhhh

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ ACTION	actionlint	1		0	0	0.26s
✅ COPYPASTE	jscpd	yes		no	no	0.8s
✅ REPOSITORY	gitleaks	yes		no	no	58.74s
✅ REPOSITORY	git_diff	yes		no	no	0.53s
✅ REPOSITORY	secretlint	yes		no	no	30.6s
✅ REPOSITORY	trivy	yes		no	no	17.85s
✅ YAML	yamllint	1		0	0	0.56s

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