Bump Microsoft.AspNetCore.OpenApi in /src/WebApiTemplate

Bumps [Microsoft.AspNetCore.OpenApi](https://github.com/dotnet/aspnetcore) from 7.0.12 to 7.0.14.
- [Release notes](https://github.com/dotnet/aspnetcore/releases)
- [Changelog](https://github.com/dotnet/aspnetcore/blob/main/docs/ReleasePlanning.md)
- [Commits](dotnet/aspnetcore@v7.0.12...v7.0.14)

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

Signed-off-by: dependabot[bot] <support@github.com>

src/WebApiTemplate/Directory.Packages.props

@@ -19,7 +19,7 @@
 
   <!-- ASP.NET Core Package Versions -->
   <ItemGroup>
-    <PackageVersion Include="Microsoft.AspNetCore.OpenApi" Version="7.0.12" />
+    <PackageVersion Include="Microsoft.AspNetCore.OpenApi" Version="7.0.14" />
     <PackageVersion Include="Swashbuckle.AspNetCore" Version="6.5.0" />
     <PackageVersion Include="Microsoft.Extensions.Hosting" Version="7.0.1" />
   </ItemGroup>