Upgrade OpenTelemetry.Api to 1.15.3 for CVE-2026-40894

Motivation
----------
Fix vuln https://nvd.nist.gov/vuln/detail/CVE-2026-40894

Change-Id: I002f42b24a29cc8e621746201a6036937228fdb7
Reviewed-on: https://review.couchbase.org/c/couchbase-net-client/+/245090
Tested-by: Build Bot <build@couchbase.com>
Reviewed-by: David Kelly <davidmichaelkelly@gmail.com>

Author: jeffrymorris

Directory.Packages.props

@@ -23,8 +23,8 @@
     <PackageVersion Include="Microsoft.Extensions.Options" Version="10.0.1" />
     <PackageVersion Include="Microsoft.Extensions.Logging" Version="10.0.1" />
     <PackageVersion Include="Newtonsoft.Json" Version="13.0.4" />
-    <PackageVersion Include="OpenTelemetry" Version="1.14.0" />
-    <PackageVersion Include="OpenTelemetry.Api" Version="1.14.0" />
+    <PackageVersion Include="OpenTelemetry" Version="1.15.3" />
+    <PackageVersion Include="OpenTelemetry.Api" Version="1.15.3" />
     <PackageVersion Include="Snappier" Version="1.3.1" />
     <PackageVersion Include="System.IO.Hashing" Version="10.0.1" />
     <PackageVersion Include="System.IO.Pipelines" Version="10.0.1" />
@@ -50,9 +50,9 @@
     <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.Exporter.Console" 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.Exporter.Console" Version="1.15.3" />
+    <PackageVersion Include="OpenTelemetry.Exporter.InMemory" Version="1.15.3" />
+    <PackageVersion Include="OpenTelemetry.Exporter.OpenTelemetryProtocol" Version="1.15.3" />
     <PackageVersion Include="Serilog.Extensions.Logging" Version="3.1.0" />
     <PackageVersion Include="Serilog.Extensions.Logging.File" Version="3.0.0" />
     <PackageVersion Include="Serilog.Sinks.Console" Version="4.0.1" />
@@ -64,4 +64,4 @@
     <PackageVersion Include="coverlet.collector" Version="6.0.4" />
     <PackageVersion Include="Xunit.Repeat" Version="1.1.26" />
   </ItemGroup>
-</Project>
+</Project>