chore(deps): update dependency system.memory to 4.6.1 (#340)

Author: renovate[bot]

src/Prometheus.Client/Prometheus.Client.csproj

@@ -5,7 +5,7 @@
     <RepositoryUrl>https://github.com/prom-client-net/prom-client</RepositoryUrl>
   </PropertyGroup>
   <ItemGroup Condition="'$(TargetFramework)' == 'net462' OR '$(TargetFramework)' == 'netstandard2.0'">
-    <PackageReference Include="System.Memory" Version="4.6.0" />
+    <PackageReference Include="System.Memory" Version="4.6.1" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\Prometheus.Client.Abstractions\Prometheus.Client.Abstractions.csproj" />