SAST Rule Enhancement corresponding to #440407 (python/flask/security/injection/tainted-sql-string)

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• Changelog entry added
• Documentation created/updated for GitLab EE, if necessary
• Documentation created/updated for this project, if necessary
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Job definition updated, if necessary
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• Conforms to the code review guidelines
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• Security reports checked/validated by reviewer