Bump OpenTelemetry.Extensions.Hosting from 1.8.1 to 1.15.0

---
updated-dependencies:
- dependency-name: OpenTelemetry.Extensions.Hosting
  dependency-version: 1.15.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

GraphMailRelay/GraphMailRelay.csproj

@@ -21,7 +21,7 @@
 		<PackageReference Include="Microsoft.Graph" Version="5.51.0" />
 		<PackageReference Include="MimeKit" Version="4.7.1" />
 		<PackageReference Include="OpenTelemetry.Exporter.Console" Version="1.9.0" />
-		<PackageReference Include="OpenTelemetry.Extensions.Hosting" Version="1.8.1" />
+		<PackageReference Include="OpenTelemetry.Extensions.Hosting" Version="1.15.0" />
 		<PackageReference Include="OpenTelemetry.Instrumentation.Http" Version="1.8.1" />
 		<PackageReference Include="SmtpServer" Version="10.0.1" />
 	</ItemGroup>