chore(deps): Bump Microsoft.OpenApi from 2.11.0 to 2.12.0

[dependabot]

Updated Microsoft.OpenApi from 2.11.0 to 2.12.0.

Release notes

Sourced from Microsoft.OpenApi's releases.

2.12.0

2.12.0 (2026-08-12)

Features

• adds deserialization of the example extension (095ae3b)
• serialize license identifier as extension for earlier versions (d5cdce8)
• serialize license identifier as extension for earlier versions (fde38d8)

Bug Fixes

• better nullability round-tripping (7a25659)
• bound YAML anchor/alias expansion to prevent OOM (billion laughs) (#​3000) (a361360)
• bound YAML anchor/alias expansion to prevent OOM (billion laughs) (#​3000) (4db9af0)
• library: serialize multiple schema types as anyOf/oneOf for OpenAPI 3.0 (6568896)
• marks deprecated properties from the specification as obsolete (26aba69)
• marks deprecated properties from the specification as obsolete (abc5301)
• schema: serialize compatibility examples from examples list (be57a7c)
• serialize examples as extension in v2/v3 (d27141b)

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