Bump the dotnet group with 1 update (#47495)

Bumps xunit.runner.visualstudio to 3.1.3

---
updated-dependencies:
- dependency-name: xunit.runner.visualstudio
  dependency-version: 3.1.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: dotnet
- dependency-name: xunit.runner.visualstudio
  dependency-version: 3.1.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: dotnet
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

samples/snippets/core/testing/unit-testing-best-practices/csharp/after/unit-testing-best-practices-after.csproj

@@ -10,7 +10,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
     <PackageReference Include="xunit" Version="2.9.3" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="3.1.2" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="3.1.3" />
   </ItemGroup>
 
   <ItemGroup>

samples/snippets/core/testing/unit-testing-best-practices/csharp/before/unit-testing-best-practices-before.csproj

@@ -10,7 +10,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
     <PackageReference Include="xunit" Version="2.9.3" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="3.1.2" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="3.1.3" />
   </ItemGroup>
 
   <ItemGroup>