chore(deps): bump Microsoft.OpenApi

Bumps [Microsoft.OpenApi](https://github.com/Microsoft/OpenAPI.NET) from 2.0.0-preview8 to 2.0.0-preview9.
- [Release notes](https://github.com/Microsoft/OpenAPI.NET/releases)
- [Changelog](https://github.com/microsoft/OpenAPI.NET/blob/main/CHANGELOG.md)
- [Commits](microsoft/OpenAPI.NET@v2.0.0-preview8...v2.0.0-preview9)

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

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

Author: dependabot[bot]

src/Microsoft.OpenApi.OData.Reader/Microsoft.OpenAPI.OData.Reader.csproj

@@ -29,7 +29,7 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
     <PackageReference Include="Microsoft.OData.Edm" Version="8.2.3" />
-    <PackageReference Include="Microsoft.OpenApi" Version="2.0.0-preview8" />
+    <PackageReference Include="Microsoft.OpenApi" Version="2.0.0-preview9" />
 	<None Include="..\..\README.md" Pack="true" PackagePath="\" />
 	<PackageReference Include="Microsoft.VisualStudio.Threading.Analyzers" Version="17.13.2">
 	  <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>

test/Microsoft.OpenAPI.OData.Reader.Tests/Microsoft.OpenAPI.OData.Reader.Tests.csproj

@@ -88,7 +88,7 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
-    <PackageReference Include="Microsoft.OpenApi" Version="2.0.0-preview8" />
+    <PackageReference Include="Microsoft.OpenApi" Version="2.0.0-preview9" />
     <PackageReference Include="moq" Version="4.20.72" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.13.0" />
     <PackageReference Include="xunit" Version="2.9.3" />

tool/UpdateDocs/UpdateDocs.csproj

@@ -13,6 +13,6 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.OData.Edm" Version="8.2.3" />
-    <PackageReference Include="Microsoft.OpenApi" Version="2.0.0-preview8" />
+    <PackageReference Include="Microsoft.OpenApi" Version="2.0.0-preview9" />
   </ItemGroup>
 </Project>