Update dependency io.swagger.parser.v3:swagger-parser to v2.1.18

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
io.swagger.parser.v3:swagger-parser (source)	2.1.16 -> 2.1.18

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Release Notes

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

v2.1.18: Swagger-parser 2.1.18 released!

• fix compiler release, revert to 8 (#​1990)

v2.1.17: Swagger-parser 2.1.17 released!

• update dependencies (#​1987)
• Revert "Bugfix 1955 Schema refs of array parameters are not resolved for renamed schema components" (#​1977)
• Revert "Add fallback to Thread Context Class Loader for resource loading" (#​1976)
• Add fallback to Thread Context Class Loader for resource loading (#​1969)
• Bugfix 1955 Schema refs of array parameters are not resolved for renamed schema components (#​1956)
• Bug/1951 improve handling of missing schema map (#​1952)
• test compatibility fixing (#​1947)

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