Bump xunit from 2.5.1 to 2.5.3 (#213)

Bumps [xunit](https://github.com/xunit/xunit) from 2.5.1 to 2.5.3.
- [Commits](https://github.com/xunit/xunit/commits)

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

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

Author: dependabot[bot]

test/Serilog.Sinks.Grafana.Loki.Tests/Serilog.Sinks.Grafana.Loki.Tests.csproj

@@ -10,7 +10,7 @@
     <ItemGroup>
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.7.2" />
         <PackageReference Include="Shouldly" Version="4.2.1" />
-        <PackageReference Include="xunit" Version="2.5.1" />
+        <PackageReference Include="xunit" Version="2.5.3" />
         <PackageReference Include="xunit.runner.visualstudio" Version="2.5.1">
             <PrivateAssets>all</PrivateAssets>
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>