Update package references to remove version numbers for consistency and add centralized package version management

Author: lextm

Directory.Build.props

@@ -0,0 +1,5 @@
+<Project>
+  <PropertyGroup>
+    <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
+  </PropertyGroup>
+</Project>

Directory.Packages.props

@@ -0,0 +1,15 @@
+<Project>
+  <ItemGroup>
+    <PackageVersion Include="AltCover" Version="9.0.1" />
+    <PackageVersion Include="GitVersion.MsBuild" Version="6.4.0" />
+    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.0.0" />
+    <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="8.0.0" />
+    <PackageVersion Include="NSubstitute" Version="5.3.0" />
+    <PackageVersion Include="Nullable" Version="1.3.1" />
+    <PackageVersion Include="SonarAnalyzer.CSharp" Version="10.15.0.120848" />
+    <PackageVersion Include="System.Net.Sockets" Version="4.3.0" />
+    <PackageVersion Include="System.Runtime.Serialization.Formatters" Version="9.0.10" />
+    <PackageVersion Include="xunit" Version="2.9.3" />
+    <PackageVersion Include="xunit.runner.visualstudio" Version="2.8.2" />
+  </ItemGroup>
+</Project>

SharpSnmpLib/SharpSnmpLib.csproj

@@ -45,16 +45,16 @@
     <NoWarn>S5547;S907;S1133;S101;S1135</NoWarn>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="GitVersion.MsBuild" Version="6.0.2">
+    <PackageReference Include="GitVersion.MsBuild">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
-    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0" PrivateAssets="all" />
-    <PackageReference Include="Nullable" Version="1.3.1">
+    <PackageReference Include="Microsoft.SourceLink.GitHub" PrivateAssets="all" />
+    <PackageReference Include="Nullable">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
-    <PackageReference Include="SonarAnalyzer.CSharp" Version="9.32.0.97167">
+    <PackageReference Include="SonarAnalyzer.CSharp">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>

Tests/CSharpCore/Tests.NetStandard.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk" ToolsVersion="17.0">
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup Label="Configuration">
     <RootNamespace>Lextm.SharpSnmpLib</RootNamespace>
     <SignAssembly>True</SignAssembly>
@@ -35,17 +35,21 @@
     <None Include="sharpsnmplib.tests.snk" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="AltCover" Version="8.9.3" />
-    <PackageReference Include="xunit" Version="2.9.2" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2">
+    <PackageReference Include="AltCover" />
+    <PackageReference Include="xunit" />
+    <PackageReference Include="xunit.runner.visualstudio" />
+    <PackageReference Include="AltCover" />
+    <PackageReference Include="NSubstitute" />
+    <PackageReference Include="xunit" />
+    <PackageReference Include="xunit.runner.visualstudio">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" />
   </ItemGroup>
   <ItemGroup Condition="'$(TargetFramework)'!='net471'">
-    <PackageReference Include="System.Net.Sockets" Version="4.3.0" />
-    <PackageReference Include="System.Runtime.Serialization.Formatters" Version="9.0.0-*" />
+    <PackageReference Include="System.Net.Sockets" />
+    <PackageReference Include="System.Runtime.Serialization.Formatters" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\..\SharpSnmpLib\SharpSnmpLib.csproj" />