Bump prometheus-net from 4.1.1 to 4.2.0

Bumps [prometheus-net](https://github.com/prometheus-net/prometheus-net) from 4.1.1 to 4.2.0.
- [Release notes](https://github.com/prometheus-net/prometheus-net/releases)
- [Changelog](https://github.com/prometheus-net/prometheus-net/blob/master/History)
- [Commits](https://github.com/prometheus-net/prometheus-net/compare/v4.1.1...v4.2.0)

---
updated-dependencies:
- dependency-name: prometheus-net
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

OhmGraphite/OhmGraphite.csproj

@@ -37,7 +37,7 @@
   <ItemGroup>
     <PackageReference Include="InfluxDB.Client" Version="2.0.0" />
     <PackageReference Include="Npgsql" Version="5.0.7" />
-    <PackageReference Include="prometheus-net" Version="4.1.1" />
+    <PackageReference Include="prometheus-net" Version="4.2.0" />
     <PackageReference Include="System.Configuration.ConfigurationManager" Version="5.0.0" />
     <PackageReference Include="TopShelf" Version="4.3.0" />
     <PackageReference Include="Topshelf.NLog" Version="4.3.0" />