Bump xunit.analyzers from 1.3.0 to 1.4.0 in /src (#31)

Bumps [xunit.analyzers](https://github.com/xunit/xunit.analyzers) from 1.3.0 to 1.4.0.
- [Commits](xunit/xunit.analyzers@1.3.0...1.4.0)

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

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

src/Directory.Packages.props

@@ -57,7 +57,7 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
-    <PackageVersion Include="xunit.analyzers" Version="1.3.0" />
+    <PackageVersion Include="xunit.analyzers" Version="1.4.0" />
     <PackageReference Include="xunit.analyzers">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>