[Slim] Security samples script fails

Created by: ybelenko

Description

Following instruction for every PR I've noticed that I cannot generate security samples anymore.

openapi-generator version

3.2.0-SNAPSHOT

OpenAPI declaration file content or url

petstore-security-test.yaml

Command line used for generation

$ bin/security/php-slim-server-petstore.sh

Steps to reproduce

$ bin/security/php-slim-server-petstore.sh
# START SCRIPT: bin/security/php-slim-server-petstore.sh
Exception in thread "main" org.openapitools.codegen.SpecValidationException: There were issues with 
the specification. The option can be disabled via validateSpec (Maven/Gradle) or --skip-validate-spec 
(CLI).
 | Error count: 1, Warning count: 1
Errors:
        -attribute paths.'/fake'(put).descriptions is unexpected
Warnings:
        -Unused model: Return

        at org.openapitools.codegen.config.CodegenConfigurator.toClientOptInput(CodegenConfigurator.java:541)
        at org.openapitools.codegen.cmd.Generate.run(Generate.java:323)
        at org.openapitools.codegen.OpenAPIGenerator.main(OpenAPIGenerator.java:59)
Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=256M; support was removed in 8.0

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