Bump github.com/pb33f/libopenapi from 0.18.4 to 0.18.6

[dependabot]

Bumps github.com/pb33f/libopenapi from 0.18.4 to 0.18.6.

Release notes

Sourced from github.com/pb33f/libopenapi's releases.

v0.18.6

Solves issue pb33f/libopenapi#333

• Accessing GetAllComponentSchemas causes a race condition error during usage.
• Adds a RWLock to ensure that the map object is safely created across go routines. This pattern is used for other similar fields

Add nil check on Document Render to avoid panic

Expanded the existing check during Render to generally check for a nil highOpenAPI3Model, with more specific error message depending on if it's Swagger or not.

Also added a check for the info which is a pointer, so could technically be nil. Added a test case to ensure we error. Without my changes the test panics which we're trying to avoid.

Fix: resolve remote relative refs correctly

Some deep dark glitches in the index resulted in some random relative $ref's being missed under certain edge conditions.

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This release was 100% provided by the community

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@​califlower @​inFocus7 @​felixjung

v0.18.5

Added a high level model cache that prevents the over production of schemas when walking the model.

A new cache interface and implementation have been added to index, so the cache design can be re-used anywhere else its needed as we work towards cleaning up memory use.

Commits

• 27d7834 Bump project coverage
• c8c2d35 Ensure URL paths don't use Windows backslashes
• 87abac5 Remove error message check
• a165dcd Ensure external indexes are added to indexes
• 84ee059 Remove remote file from processing only after building index
• 4f962a6 Add comments for documentation
• f8424af Cleanup
• c4d11e8 Strip trailing slashes from BaseURL
• 966d379 Document that BaseURL should not lead to a file
• 5fbecd0 Add bundler test cases
• Additional commits viewable in compare view

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