Bump Elastic.Clients.Elasticsearch from 8.15.8 to 8.15.9 (#573)

Bumps [Elastic.Clients.Elasticsearch](https://github.com/elastic/elasticsearch-net) from 8.15.8 to 8.15.9.
- [Release notes](https://github.com/elastic/elasticsearch-net/releases)
- [Changelog](https://github.com/elastic/elasticsearch-net/blob/main/CHANGELOG.md)
- [Commits](elastic/elasticsearch-net@8.15.8...8.15.9)

---
updated-dependencies:
- dependency-name: Elastic.Clients.Elasticsearch
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Directory.Packages.props

@@ -9,7 +9,7 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
     </PackageVersion>
-    <PackageVersion Include="Elastic.Clients.Elasticsearch" Version="8.15.8" />
+    <PackageVersion Include="Elastic.Clients.Elasticsearch" Version="8.15.9" />
     <PackageVersion Include="ElmahCore" Version="2.1.2" />
     <PackageVersion Include="FluentAssertions" Version="6.12.1" />
     <PackageVersion Include="JunitXml.TestLogger" Version="4.0.254" />