Bump the opentelemetry-testing group with 6 updates (#1174)

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Stephen Toub <stoub@microsoft.com>

Author: dependabot[bot]

Directory.Packages.props

@@ -77,12 +77,12 @@
     <PackageVersion Include="Microsoft.Extensions.TimeProvider.Testing" Version="10.1.0" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />
     <PackageVersion Include="Moq" Version="4.20.72" />
-    <PackageVersion Include="OpenTelemetry" Version="1.14.0" />
-    <PackageVersion Include="OpenTelemetry.Exporter.InMemory" Version="1.14.0" />
-    <PackageVersion Include="OpenTelemetry.Exporter.OpenTelemetryProtocol" Version="1.14.0" />
-    <PackageVersion Include="OpenTelemetry.Instrumentation.Http" Version="1.14.0" />
-    <PackageVersion Include="OpenTelemetry.Extensions.Hosting" Version="1.14.0" />
-    <PackageVersion Include="OpenTelemetry.Instrumentation.AspNetCore" Version="1.14.0" />
+    <PackageVersion Include="OpenTelemetry" Version="1.15.0" />
+    <PackageVersion Include="OpenTelemetry.Exporter.InMemory" Version="1.15.0" />
+    <PackageVersion Include="OpenTelemetry.Exporter.OpenTelemetryProtocol" Version="1.15.0" />
+    <PackageVersion Include="OpenTelemetry.Instrumentation.Http" Version="1.15.0" />
+    <PackageVersion Include="OpenTelemetry.Extensions.Hosting" Version="1.15.0" />
+    <PackageVersion Include="OpenTelemetry.Instrumentation.AspNetCore" Version="1.15.0" />
     <PackageVersion Include="Serilog.Extensions.Hosting" Version="10.0.0" />
     <PackageVersion Include="Serilog.Extensions.Logging" Version="10.0.0" />
     <PackageVersion Include="Serilog.Sinks.Console" Version="6.1.1" />