Fixed input validation & gke module version

[anaik91]

Fixes #41

It's a good idea to open an issue first for discussion.

• Tests pass
• Appropriate changes to README are included in PR

[github-actions]

🦙 MegaLinter status: ⚠️ WARNING

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ ACTION	actionlint	2		0	0.02s
✅ BASH	bash-exec	5		0	0.02s
✅ BASH	shellcheck	5		0	0.1s
⚠️ BASH	shfmt	5		4	0.01s
⚠️ COPYPASTE	jscpd	yes		2	1.48s
✅ DOCKERFILE	hadolint	1		0	0.08s
✅ JSON	jsonlint	2		0	0.16s
⚠️ JSON	prettier	2		1	0.6s
✅ JSON	v8r	2		0	2.26s
⚠️ MARKDOWN	markdownlint	22		203	0.88s
⚠️ MARKDOWN	markdown-link-check	22		2	11.28s
⚠️ MARKDOWN	markdown-table-formatter	22		1	0.36s
⚠️ PYTHON	bandit	3		8	0.94s
⚠️ PYTHON	black	3		1	1.14s
✅ PYTHON	flake8	3		0	0.45s
⚠️ PYTHON	isort	3		1	0.21s
✅ PYTHON	mypy	3		0	7.25s
✅ PYTHON	ruff	3		0	0.01s
⚠️ REPOSITORY	checkov	yes		13	15.9s
⚠️ REPOSITORY	devskim	yes		25	2.1s
✅ REPOSITORY	dustilock	yes		no	0.01s
✅ REPOSITORY	gitleaks	yes		no	0.19s
✅ REPOSITORY	git_diff	yes		no	0.01s
✅ REPOSITORY	grype	yes		no	15.98s
✅ REPOSITORY	secretlint	yes		no	1.26s
✅ REPOSITORY	syft	yes		no	0.24s
⚠️ REPOSITORY	trivy	yes		1	14.82s
✅ REPOSITORY	trivy-sbom	yes		no	13.65s
✅ REPOSITORY	trufflehog	yes		no	2.97s
⚠️ SPELL	cspell	166		828	22.87s
⚠️ SPELL	lychee	122		24	47.39s
✅ TERRAFORM	terraform-fmt	6		0	0.17s
⚠️ TERRAFORM	terrascan	yes		1	9.94s
✅ XML	xmllint	6		0	0.0s
⚠️ YAML	prettier	98		1	2.33s
✅ YAML	v8r	98		0	46.46s
✅ YAML	yamllint	98		0	1.09s

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