Bump System.Configuration.ConfigurationManager from 6.0.1 to 7.0.0

Bumps [System.Configuration.ConfigurationManager](https://github.com/dotnet/runtime) from 6.0.1 to 7.0.0.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](https://github.com/dotnet/runtime/commits)

---
updated-dependencies:
- dependency-name: System.Configuration.ConfigurationManager
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

OhmGraphite/OhmGraphite.csproj

@@ -39,7 +39,7 @@
     <PackageReference Include="InfluxDB.Client" Version="4.6.0" />
     <PackageReference Include="Npgsql" Version="6.0.7" />
     <PackageReference Include="prometheus-net" Version="7.0.0" />
-    <PackageReference Include="System.Configuration.ConfigurationManager" Version="6.0.1" />
+    <PackageReference Include="System.Configuration.ConfigurationManager" Version="7.0.0" />
     <PackageReference Include="TopShelf" Version="4.3.0" />
     <PackageReference Include="Topshelf.NLog" Version="4.3.0" />
     <PackageReference Include="InfluxDB.LineProtocol" Version="1.1.1" />