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

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
io.swagger.parser.v3:swagger-parser (source)	2.1.18 -> 2.1.20

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Release Notes

swagger-api/swagger-parser (io.swagger.parser.v3:swagger-parser)

v2.1.20: Swagger-parser 2.1.20 released!

• update dependencies (#​2042)
• fixed issue 2034, added test case for issue (#​2035)
• SWG-9288 utilizing safe url resolver for OAS 3.0 parsing (#​2032)

v2.1.19: Swagger-parser 2.1.19 released!

• bump swagger-core to 2.2.19 (#​2019)
• fix dependabot file (#​2018)
• Bump commons-io:commons-io from 2.14.0 to 2.15.0 (#​2014)
• Bump org.apache.maven.plugins:maven-shade-plugin from 3.3.0 to 3.5.1 (#​2013)
• Bump org.apache.maven.plugins:maven-enforcer-plugin from 3.2.1 to 3.4.1 (#​2012)
• Bump com.github.tomakehurst:wiremock-jre8 from 2.35.0 to 2.35.1 (#​2009)
• Bump org.apache.maven.plugins:maven-surefire-plugin from 3.0.0 to 3.2.2 (#​2008)
• Bump org.apache.maven.plugins:maven-compiler-plugin from 3.10.1 to 3.11.0 (#​2004)
• Bump org.apache.maven.plugins:maven-javadoc-plugin from 3.5.0 to 3.6.2 (#​2002)
• Bump org.apache.maven.plugins:maven-source-plugin from 3.2.1 to 3.3.0 (#​2000)
• deps update and check in CI (#​1999)
• fix safeUrlResolving tests (#​1998)
• feat: introduce cache loaded extensions in OpenAPIDeserializer (#​1997)
• Fixes issue 1975: bug in const processing, const values of all types now processable (#​1996)
• fix parser dereferencing when pathItems are the same (#​1994)

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