Bump io.swagger.parser.v3:swagger-parser from 2.1.20 to 2.1.21

[dependabot[bot]]

Bumps io.swagger.parser.v3:swagger-parser from 2.1.20 to 2.1.21.

Release notes

Sourced from io.swagger.parser.v3:swagger-parser's releases.

Swagger-parser 2.1.21 released!

• keep allOf, anyOf, oneOf alongside properties while flattening (#2061)
• Fix issue #2037 (#2052)
• [Issue 2048] NullPointerException in SchemaProcessor.processArraySchema() (#2049)
• [Issue 2046] NPE in OpenAPIV3Parser.read(String, List, ParseOptions) (#2047)

Commits

• 24a1dfa prepare release 2.1.21
• 3695edd keep allOf, anyOf, oneOf alongside properties while flattening
• 285907c Merge pull request #2052 from swagger-api/issue-2037
• 89be06a add test and fix response resolver
• d380fbf add JavaTimeModule
• 7d6bad8 Merge pull request #2047 from garydgregory/Issue2046
• 6717e8e Merge branch 'master' into Issue2046
• d057528 Merge pull request #2049 from garydgregory/Issue2048
• 19c65e7 [Issue 2046] NPE in OpenAPIV3Parser.read(String,
• 25381a3 [Issue 2048] NullPointerException: Cannot invoke
• Additional commits viewable in compare view

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 68.98%. Comparing base (cd3a583) to head (c4f3555).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #153 +/- ## ============================================ - Coverage 69.00% 68.98% -0.02% Complexity 1042 1042 ============================================ Files 84 84 Lines 4436 4434 -2 Branches 604 603 -1 ============================================ - Hits 3061 3059 -2 Misses 1170 1170 Partials 205 205 ```

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