Swagger-core 2.2.31 released!

• Consistent usage of TestNG (#4885)
• refs #4878 - fix model resolution for global path parameters with openAPI 3.1 (#4884)
• fix Schema/JSONSchema instance creation for oas31 (#4883)
• issue-4850: fix extensions 'x-' prefix decoration for oas 3.1 (#4880)
• Add support for jakarta.validation.constraints.Email (#4876)
• Include Nonnull annotation from Jakarta Annotations for required items (#4875)
• feat: Support other types than string in enum schemas (#4874)
• refs #4065 - fix 'explode' resolution for parameters (#4873)
• Add unittest for v3.1 which has both ref and description (#4815)