[rg.mule.modules:mule-apikit-module] Improper Restriction of XML External Entity Reference in Mulesoft APIkit

Mulesoft APIkit through 1.3.0 allows XXE because of validation/RestXmlSchemaValidator.java

References

• https://nvd.nist.gov/vuln/detail/CVE-2020-10991
• https://github.com/mulesoft/apikit/issues/547
• https://github.com/advisories/GHSA-jffq-528j-mp6c