Bump Microsoft.Extensions.Primitives

Bumps the dotnet group in /docs/core/extensions/snippets/primitives/string with 1 update: [Microsoft.Extensions.Primitives](https://github.com/dotnet/runtime).


Updates `Microsoft.Extensions.Primitives` from 8.0.0 to 9.0.0
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v8.0.0...v9.0.0)

---
updated-dependencies:
- dependency-name: Microsoft.Extensions.Primitives
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: dotnet
...

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

Author: dependabot[bot]

docs/core/extensions/snippets/primitives/string/tokenizers.csproj

@@ -10,7 +10,7 @@
 
   <ItemGroup>
     <PackageReference Include="BenchmarkDotNet" Version="0.14.0" />
-    <PackageReference Include="Microsoft.Extensions.Primitives" Version="8.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Primitives" Version="9.0.0" />
   </ItemGroup>
 
 </Project>