fix: Rename Variable

[vkhitrin]

Rename --upload-attachment-unsafe to --upload-attachment.

Bump version to 0.3.1.

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ PYTHON	bandit	1		0	1.05s
✅ PYTHON	black	1		0	0.73s
✅ PYTHON	flake8	1		0	0.47s
✅ PYTHON	isort	1		0	0.2s
✅ PYTHON	mypy	1		0	7.06s
✅ PYTHON	pylint	1		0	3.45s
✅ PYTHON	pyright	1		0	22.82s
✅ PYTHON	ruff	1		0	0.02s
✅ REPOSITORY	checkov	yes		no	12.42s
✅ REPOSITORY	gitleaks	yes		no	0.42s
✅ REPOSITORY	git_diff	yes		no	0.01s
✅ REPOSITORY	grype	yes		no	14.78s
✅ REPOSITORY	secretlint	yes		no	0.86s
✅ REPOSITORY	trivy	yes		no	6.51s
✅ REPOSITORY	trivy-sbom	yes		no	1.18s
✅ REPOSITORY	trufflehog	yes		no	3.86s
✅ RST	rstcheck	1		0	3.91s
✅ RST	rstfmt	1		0	1.75s

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