build: Use pr-preview-action @v1.4.4 instead of SHA

[vorburger]

Was this change I made in 8e058c4 the culprit causing rossjrw/pr-preview-action#67?!

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ ACTION	actionlint	1		0	0.01s
✅ COPYPASTE	jscpd	yes		no	1.63s
✅ EDITORCONFIG	editorconfig-checker	1		0	0.01s
✅ REPOSITORY	checkov	yes		no	11.5s
✅ REPOSITORY	gitleaks	yes		no	0.17s
✅ REPOSITORY	git_diff	yes		no	0.01s
✅ REPOSITORY	grype	yes		no	11.25s
✅ REPOSITORY	secretlint	yes		no	0.8s
✅ REPOSITORY	trivy	yes		no	4.62s
✅ REPOSITORY	trivy-sbom	yes		no	1.13s
✅ REPOSITORY	trufflehog	yes		no	3.46s
✅ YAML	prettier	1	0	0	0.45s
✅ YAML	v8r	1		0	2.13s
✅ YAML	yamllint	1		0	0.59s

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