build(deps-dev): bump oteltest from 0.24.0 to 0.39.0

Bumps [oteltest](https://github.com/pmcollins/oteltest) from 0.24.0 to 0.39.0.
- [Commits](https://github.com/pmcollins/oteltest/commits)

---
updated-dependencies:
- dependency-name: oteltest
  dependency-version: 0.39.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

dev-requirements.txt

@@ -90,7 +90,7 @@ opentelemetry-semantic-conventions==0.54b1
     #   elastic-opentelemetry (pyproject.toml)
     #   opentelemetry-instrumentation
     #   opentelemetry-sdk
-oteltest==0.24.0
+oteltest==0.39.0
     # via elastic-opentelemetry (pyproject.toml)
 packaging==25.0
     # via

pyproject.toml

@@ -41,7 +41,7 @@ dependencies = [
 ]
 
 [project.optional-dependencies]
-dev = ["pytest", "pip-tools", "oteltest==0.24.0", "leb128"]
+dev = ["pytest", "pip-tools", "oteltest==0.39.0", "leb128"]
 
 [project.entry-points.opentelemetry_configurator]
 configurator = "elasticotel.distro:ElasticOpenTelemetryConfigurator"