Update dependency io.swagger.parser.v3:swagger-parser to v2.1.20

Author: renovate[bot]

pom.xml

@@ -45,7 +45,7 @@
 
         <slf4j-version>2.0.11</slf4j-version>
         <jackson-version>2.16.1</jackson-version>
-        <swagger-parser.version>2.1.18</swagger-parser.version>
+        <swagger-parser.version>2.1.20</swagger-parser.version>
     </properties>
 
     <dependencies>