Absolute servers url, workaround for Windows

"[BUG] openapi-generator-maven-plugin version 5.0.0 does not work for OpenApi 3.0 yml-files"
OpenAPITools/openapi-generator#8260

"[BUG] 5.0.0 breaks generator if servers url relative"
OpenAPITools/openapi-generator#8266

Author: julianladisch

src/main/resources/swagger.api/password-validator.yaml

@@ -3,7 +3,7 @@ info:
   title: Password validator module
   version: v1
 servers:
-  - url: /tenant/
+  - url: http://localhost:8081
 paths:
   /password/validate:
     post:

src/main/resources/swagger.api/validator-registry.yaml

@@ -3,7 +3,7 @@ info:
   title: Validator Registry
   version: v1
 servers:
-  - url: /tenant/
+  - url: http://localhost:8081
 paths:
   /rules:
     get: