Bump System.Buffers and System.Diagnostics.DiagnosticSource

Bumps System.Buffers and [System.Diagnostics.DiagnosticSource](https://github.com/dotnet/runtime). These dependencies needed to be updated together.

Updates `System.Buffers` from 4.5.1 to 4.5.1

Updates `System.Diagnostics.DiagnosticSource` from 8.0.1 to 9.0.0
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v8.0.1...v9.0.0)

---
updated-dependencies:
- dependency-name: System.Buffers
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: System.Diagnostics.DiagnosticSource
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

src/OpenSearch.Net/OpenSearch.Net.csproj

@@ -24,7 +24,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.CSharp" Version="4.7.0" />
     <PackageReference Include="System.Buffers" Version="4.5.1" />
-    <PackageReference Include="System.Diagnostics.DiagnosticSource" Version="8.0.1" />
+    <PackageReference Include="System.Diagnostics.DiagnosticSource" Version="9.0.0" />
 
     <PackageReference Condition="'$(TargetFramework)' == 'netstandard2.0'" Include="System.Reflection.Emit" Version="4.7.0" />
     <PackageReference Condition="'$(TargetFramework)' == 'netstandard2.0'" Include="System.Reflection.Emit.Lightweight" Version="4.7.0" />

tests/Tests.ScratchPad/Tests.ScratchPad.csproj

@@ -11,7 +11,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="System.Diagnostics.DiagnosticSource" Version="8.0.1" />
+    <PackageReference Include="System.Diagnostics.DiagnosticSource" Version="9.0.0" />
     <PackageReference Include="BenchMarkDotNet" Version="0.14.0" />
   </ItemGroup>
 </Project>