chore(deps): bump xunit from 2.7.0 to 2.9.2 in /FirebaseAdmin

Bumps [xunit](https://github.com/xunit/xunit) from 2.7.0 to 2.9.2.
- [Commits](xunit/xunit@v2-2.7.0...v2-2.9.2)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

FirebaseAdmin/FirebaseAdmin.IntegrationTests/FirebaseAdmin.IntegrationTests.csproj

@@ -13,7 +13,7 @@
     <PackageReference Include="Microsoft.AspNetCore.WebUtilities" Version="2.2.0" />
     <PackageReference Include="System.Collections.Immutable" Version="8.0.0" /> 
     <PackageReference Include="System.Text.Json" Version="8.0.4" /> 
-    <PackageReference Include="xunit" Version="2.7.0" />
+    <PackageReference Include="xunit" Version="2.9.2" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>

FirebaseAdmin/FirebaseAdmin.Tests/FirebaseAdmin.Tests.csproj

@@ -19,7 +19,7 @@
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
     <PackageReference Include="System.Collections.Immutable" Version="8.0.0" />
     <PackageReference Include="System.Linq.Async" Version="6.0.1" />
-    <PackageReference Include="xunit" Version="2.7.0" />
+    <PackageReference Include="xunit" Version="2.9.2" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>