Bump github.com/pb33f/libopenapi from 0.21.8 to 0.21.12

[dependabot]

Bumps github.com/pb33f/libopenapi from 0.21.8 to 0.21.12.

Release notes

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

v0.21.12

Fixes issue reported in pb33f/openapi-changes#203

Also stops a $ref swap out from being a breaking change in the what-changed module.

v0.21.11

Fixes handling of circular references when rendering, handles a nil pointer exception.

@​geniegeist

v0.21.10

Fixes a few more glitches and gaps.

@​geniegeist

v0.21.9

Fixes a number of issues across models and the what_changed module after stress testing.

Also fixes the following issues:

• #380
• #400
• #403

Includes contributions from @​vishalg0wda @​jvogit @​vkd

Commits

• 8c92d63 added a nill check.
• 363bd65 fixed a glitch in property name sorting when diffing.
• f584200 flipping a reference backward and forward should not be a breaking change
• 154778d Bump github.com/speakeasy-api/jsonpath from 0.6.1 to 0.6.2
• 4793163 Add more tests
• 2f0eafb Add test for dependent schemas
• e8453c7 Add test for oneOf
• 8bdea1c Add test for skipping circular property
• b195fd1 Add test for failing to render circular references
• 7dc3ee9 Add test for skipping optional fields
• Additional commits viewable in compare view

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