Updating Java XXE rule - SAXParserFactory Disallow Doctype Decl Missing

What does this MR do?

1. Updates the SAXParserFactory Disallow Doctype Decl Missing SAST rule with upgraded patterns from community rule.
2. Updates corresponding test files
3. Changes mapping

What are the relevant issue numbers?

Addresses issue: gitlab-org/gitlab#441034 (closed)

Does this MR meet the acceptance criteria?

• 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
• Conforms to the Go guidelines
• Security reports checked/validated by reviewer