Update dependency System.Text.Json to 8.0.6

| datasource | package          | from  | to    |
| ---------- | ---------------- | ----- | ----- |
| nuget      | System.Text.Json | 8.0.5 | 8.0.6 |


Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

src/Grafana.OpenTelemetry.Base/Grafana.OpenTelemetry.Base.csproj

@@ -10,7 +10,7 @@
     <PackageReference Include="Microsoft.Extensions.Configuration" Version="8.0.0" />
     <PackageReference Include="Microsoft.Extensions.Configuration.EnvironmentVariables" Version="8.0.0" />
     <PackageReference Include="Microsoft.Extensions.Logging" Version="8.0.1" />
-    <PackageReference Include="System.Text.Json" Version="8.0.5" Condition="!$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net8.0'))" />
+    <PackageReference Include="System.Text.Json" Version="8.0.6" Condition="!$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net8.0'))" />
     <PackageReference Include="MinVer" Version="6.0.0">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>