chore: centralise package versions in Directory.Packages.props

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: 274188A

Directory.Packages.props

@@ -0,0 +1,16 @@
+<Project>
+  <PropertyGroup>
+    <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageVersion Include="Newtonsoft.Json" Version="13.0.4" />
+    <PackageVersion Include="Serilog" Version="4.3.1" />
+  </ItemGroup>
+  <ItemGroup>
+    <PackageVersion Include="coverlet.collector" Version="10.0.0" />
+    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.4.0" />
+    <PackageVersion Include="xunit" Version="2.9.3" />
+    <PackageVersion Include="Xunit.SkippableFact" Version="1.5.61" />
+    <PackageVersion Include="xunit.runner.visualstudio" Version="3.1.5" />
+  </ItemGroup>
+</Project>

src/RedcapApi/RedcapApi.csproj

@@ -45,7 +45,7 @@
     <None Remove="bin\**" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="Newtonsoft.Json" Version="13.0.4" />
-    <PackageReference Include="Serilog" Version="4.3.1" />
+    <PackageReference Include="Newtonsoft.Json" />
+    <PackageReference Include="Serilog" />
   </ItemGroup>
 </Project>

tests/RedcapApi.Tests/RedcapApi.Tests.csproj

@@ -10,14 +10,14 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="coverlet.collector" Version="10.0.0">
+    <PackageReference Include="coverlet.collector">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.4.0" />
-    <PackageReference Include="xunit" Version="2.9.3" />
-    <PackageReference Include="Xunit.SkippableFact" Version="1.5.61" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5">
+    <PackageReference Include="Microsoft.NET.Test.Sdk" />
+    <PackageReference Include="xunit" />
+    <PackageReference Include="Xunit.SkippableFact" />
+    <PackageReference Include="xunit.runner.visualstudio">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>