Bump xunit from 2.9.1 to 2.9.2 in /source

Bumps [xunit](https://github.com/xunit/xunit) from 2.9.1 to 2.9.2.
- [Commits](xunit/xunit@v2-2.9.1...v2-2.9.2)

---
updated-dependencies:
- dependency-name: xunit
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

tests/MailKitSimplified.Receiver.Tests/MailKitSimplified.Receiver.Tests.csproj

@@ -14,7 +14,7 @@
     <PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="8.0.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
     <PackageReference Include="Moq" Version="4.20.72" />
-    <PackageReference Include="xunit" Version="2.9.1" />
+    <PackageReference Include="xunit" Version="2.9.2" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>

tests/MailKitSimplified.Sender.Tests/MailKitSimplified.Sender.Tests.csproj

@@ -14,7 +14,7 @@
     <PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="8.0.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
     <PackageReference Include="Moq" Version="4.20.72" />
-    <PackageReference Include="xunit" Version="2.9.1" />
+    <PackageReference Include="xunit" Version="2.9.2" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>