Bump Microsoft.Extensions.Configuration in /dev-proxy

Bumps [Microsoft.Extensions.Configuration](https://github.com/dotnet/runtime) from 8.0.0 to 9.0.0.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v8.0.0...v9.0.0)

---
updated-dependencies:
- dependency-name: Microsoft.Extensions.Configuration
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

dev-proxy-abstractions/dev-proxy-abstractions.csproj

@@ -11,7 +11,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="8.0.10" />
-    <PackageReference Include="Microsoft.Extensions.Configuration" Version="8.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Configuration" Version="9.0.0" />
     <PackageReference Include="Microsoft.Extensions.Configuration.Binder" Version="8.0.2" />
     <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="8.0.1" />
     <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="8.0.2" />

dev-proxy/dev-proxy.csproj

@@ -31,7 +31,7 @@
   <ItemGroup>
     <PackageReference Include="Azure.Identity" Version="1.13.1" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="8.0.10" />
-    <PackageReference Include="Microsoft.Extensions.Configuration" Version="8.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Configuration" Version="9.0.0" />
     <PackageReference Include="Microsoft.Extensions.Configuration.Binder" Version="8.0.2" />
     <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="8.0.1" />
     <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="8.0.1" />