chore: bump version

Author: phnx47

src/Prometheus.Client.MetricServer/Prometheus.Client.MetricServer.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <Description>Standalone Kestrel server for the Prometheus.Client</Description>
-    <VersionPrefix>4.2.0</VersionPrefix>
+    <VersionPrefix>4.3.0</VersionPrefix>
     <TargetFrameworks>netstandard2.0;netstandard2.1;netcoreapp3.1;net5.0</TargetFrameworks>
     <AssemblyName>Prometheus.Client.MetricServer</AssemblyName>
     <PackageId>Prometheus.Client.MetricServer</PackageId>