Fix: Address vulnerability in getDocumentBuilder()

[th555555]

This PR fixes a XXE vulnerability in getDocumentBuilder(). The PR disable external entity processing and enables secure processing by setting the XMLConstants.FEATURE_SECURE_PROCESSING feature.

Something similar can be found here soartech/jsoar@ae6a2ec

References
soartech/jsoar@ae6a2ec
https://nvd.nist.gov/vuln/detail/CVE-2023-34610

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[th555555]

/signed

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