Bump Microsoft.OpenApi from 2.0.0-preview9 to 2.3.7

---
updated-dependencies:
- dependency-name: Microsoft.OpenApi
  dependency-version: 2.3.7
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Directory.Packages.props

@@ -33,7 +33,7 @@
     <PackageVersion Include="InMemoryLogger" Version="1.0.66" />
     <PackageVersion Include="MartinCostello.Logging.XUnit.v3" Version="0.6.0" />
     <PackageVersion Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="9.0.7" />
-    <PackageVersion Include="Microsoft.OpenApi" Version="2.0.0-preview9" />
+    <PackageVersion Include="Microsoft.OpenApi" Version="2.3.7" />
     <PackageVersion Include="System.Text.Json" Version="9.0.5" />
     <PackageVersion Include="TUnit" Version="0.25.21" />
     <PackageVersion Include="xunit.v3.extensibility.core" Version="2.0.2" />