[Resources.Azure] Replace .NET 6 target with .NET 8 (open-telemetry#2165)

Author: joegoldman2

src/OpenTelemetry.Resources.Azure/CHANGELOG.md

@@ -2,6 +2,9 @@
 
 ## Unreleased
 
+* Drop support for .NET 6 as this target is no longer supported and add .NET 8 target.
+  ([#2165](https://github.com/open-telemetry/opentelemetry-dotnet-contrib/pull/2165))
+
 ## 1.0.0-beta.9
 
 Released 2024-Sep-24

src/OpenTelemetry.Resources.Azure/OpenTelemetry.Resources.Azure.csproj

@@ -1,13 +1,14 @@
 <Project Sdk="Microsoft.NET.Sdk">
+
   <PropertyGroup>
-    <TargetFrameworks>net6.0;netstandard2.0</TargetFrameworks>
-    <Description>OpenTelemetry Resource Detectors for Azure cloud environments</Description>
+    <TargetFrameworks>net8.0;$(NetStandardMinimumSupportedVersion)</TargetFrameworks>
+    <Description>OpenTelemetry Resource Detectors for Azure cloud environments.</Description>
     <PackageTags>$(PackageTags);ResourceDetector</PackageTags>
     <MinVerTagPrefix>Resources.Azure-</MinVerTagPrefix>
   </PropertyGroup>
 
-  <!--Do not run Package Baseline Validation as this package has never released a stable version.
-  Remove this property once we have released a stable version and add PackageValidationBaselineVersion property.-->
+  <!-- Do not run Package Baseline Validation as this package has never released a stable version.
+  Remove this property once we have released a stable version and add PackageValidationBaselineVersion property. -->
   <PropertyGroup>
     <DisablePackageBaselineValidation>true</DisablePackageBaselineValidation>
   </PropertyGroup>
@@ -23,4 +24,5 @@
     <Compile Include="$(RepoRoot)\src\Shared\Guard.cs" Link="Includes\Guard.cs" />
     <Compile Include="$(RepoRoot)\src\Shared\ResourceSemanticConventions.cs" Link="Includes\ResourceSemanticConventions.cs"/>
   </ItemGroup>
+
 </Project>

test/OpenTelemetry.Resources.Azure.Tests/OpenTelemetry.Resources.Azure.Tests.csproj

@@ -2,8 +2,8 @@
 
   <PropertyGroup>
     <!-- OmniSharp/VS Code requires TargetFrameworks to be in descending order for IntelliSense and analysis. -->
-    <TargetFrameworks>$(SupportedNetTargets)</TargetFrameworks>
-    <TargetFrameworks Condition="$(OS) == 'Windows_NT'">$(TargetFrameworks);net462</TargetFrameworks>
+    <TargetFrameworks>$(SupportedNetTargetsWithoutNet6)</TargetFrameworks>
+    <TargetFrameworks Condition="$(OS) == 'Windows_NT'">$(TargetFrameworks);$(NetFrameworkMinimumSupportedVersion)</TargetFrameworks>
   </PropertyGroup>
 
   <ItemGroup>