Update to .NET 9.0 including project files and CI/CD workflows

Co-authored-by: mitchelsellers <5659113+mitchelsellers@users.noreply.github.com>

Author: Copilot

.github/workflows/ci-build.yml

@@ -21,7 +21,7 @@ jobs:
     - name: Ensure .NET Installed
       uses: actions/setup-dotnet@v5
       with:
-        dotnet-version: 6.0.x
+        dotnet-version: 9.0.x
 
     - name: Install GitVersion
       uses: gittools/actions/gitversion/setup@v3.2.1
@@ -53,6 +53,10 @@ jobs:
         with:
           java-version: 17
           distribution: zulu
+      - name: Ensure .NET Installed
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: 9.0.x
       - uses: actions/checkout@v5
         with:
           fetch-depth: 0  # Shallow clones should be disabled for a better relevancy of analysis

.github/workflows/release-build.yml

@@ -20,7 +20,7 @@ jobs:
     - name: Ensure .NET Installed
       uses: actions/setup-dotnet@v5
       with:
-        dotnet-version: 6.0.x
+        dotnet-version: 9.0.x
 
     - name: Install GitVersion
       uses: gittools/actions/gitversion/setup@v3.2.1

samples/NetCore.Utilities.SpreadsheetExample/NetCore.Utilities.SpreadsheetExample.csproj

@@ -2,17 +2,17 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
   </PropertyGroup>
 
   <ItemGroup>
     <PackageReference Include="DocumentFOrmat.OpenXml" Version="2.16.0" />
-    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="6.0.0" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="9.0.0" />
   </ItemGroup>
 
   <ItemGroup>
     <Reference Include="NetCore.Utilities.Spreadsheet">
-      <HintPath>..\..\src\NetCore.Utilities.Spreadsheet\bin\Debug\net6.0\NetCore.Utilities.Spreadsheet.dll</HintPath>
+      <HintPath>..\..\src\NetCore.Utilities.Spreadsheet\bin\Debug\net9.0\NetCore.Utilities.Spreadsheet.dll</HintPath>
     </Reference>
   </ItemGroup>
 

src/NetCore.Utilities.Spreadsheet.Tests/NetCore.Utilities.Spreadsheet.Tests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <IsPackable>false</IsPackable>
     <RootNamespace>ICG.NetCore.Utilities.Spreadsheet.Tests</RootNamespace>
   </PropertyGroup>

src/NetCore.Utilities.Spreadsheet/NetCore.Utilities.Spreadsheet.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
 	<PropertyGroup>
-		<TargetFramework>net6.0</TargetFramework>
+		<TargetFramework>net9.0</TargetFramework>
 		<RootNamespace>ICG.NetCore.Utilities.Spreadsheet</RootNamespace>
 		<GenerateDocumentationFile>true</GenerateDocumentationFile>
 		<GeneratePackageOnBuild>true</GeneratePackageOnBuild>
@@ -35,7 +35,7 @@
 
 	<ItemGroup>
 		<PackageReference Include="DocumentFormat.OpenXml" Version="2.16.0" />
-		<PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="6.0.0" />
+		<PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="9.0.0" />
 		<PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.1.1">
 			<PrivateAssets>all</PrivateAssets>
 			<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>