Bump Verify from 26.6.0 to 28.9.0

Bumps [Verify](https://github.com/VerifyTests/Verify) from 26.6.0 to 28.9.0.
- [Release notes](https://github.com/VerifyTests/Verify/releases)
- [Commits](VerifyTests/Verify@26.6.0...28.9.0)

---
updated-dependencies:
- dependency-name: Verify
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Verify.MongoDB.Tests/Verify.MongoDB.Tests.csproj

@@ -8,7 +8,7 @@
 	<ItemGroup>
 		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
 		<PackageReference Include="MongoSandbox8" Version="1.0.1" />
-		<PackageReference Include="Verify.Xunit" Version="26.6.0" />
+		<PackageReference Include="Verify.Xunit" Version="28.8.1" />
 		<PackageReference Include="xunit" Version="2.9.3" />
 		<PackageReference Include="xunit.runner.visualstudio" Version="3.0.1">
 			<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>

Verify.MongoDB/Verify.MongoDB.csproj

@@ -20,7 +20,7 @@
 
   <ItemGroup>
       <PackageReference Include="MongoDB.Driver" Version="3.1.0" />
-      <PackageReference Include="Verify" Version="26.6.0" />
+      <PackageReference Include="Verify" Version="28.9.0" />
 	</ItemGroup>
 
   <ItemGroup>