Update dependency io.swagger.parser.v3:swagger-parser to v2.1.21

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
io.swagger.parser.v3:swagger-parser (source)	2.1.20 -> 2.1.21

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Release Notes

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

### [`v2.1.21`](https://togithub.com/swagger-api/swagger-parser/releases/tag/v2.1.21): Swagger-parser 2.1.21 released! - keep allOf, anyOf, oneOf alongside properties while flattening ([#​2061](https://togithub.com/swagger-api/swagger-parser/issues/2061)) - Fix issue [#​2037](https://togithub.com/swagger-api/swagger-parser/issues/2037) ([#​2052](https://togithub.com/swagger-api/swagger-parser/issues/2052)) - \[Issue 2048] NullPointerException in SchemaProcessor.processArraySchema() ([#​2049](https://togithub.com/swagger-api/swagger-parser/issues/2049)) - \[Issue 2046] NPE in OpenAPIV3Parser.read(String, List, ParseOptions) ([#​2047](https://togithub.com/swagger-api/swagger-parser/issues/2047))

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[sonarcloud[bot]]

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