build: swaggerVersion to 2.1.13 (#662)

Author: micronaut-build

gradle.properties

@@ -5,7 +5,7 @@ micronautDocsVersion=2.0.0
 micronautVersion=3.3.0-M1
 micronautTestVersion=3.0.5
 groovyVersion=3.0.9
-spockVersion=2.0-groovy-3.0
+spockVersion=2.1-groovy-3.0
 
 title=OpenAPI/Swagger Support
 projectDesc=Configuration to integrate Micronaut and OpenAPI/Swagger
@@ -19,6 +19,6 @@ bomProperties=swaggerVersion
 
 rxJava2Version=2.2.21
 rxJava3Version=3.1.3
-swaggerVersion=2.1.12
+swaggerVersion=2.1.13
 kotlinVersion=1.5.31
 junitVersion=5.7.2