style(tracing): sort test imports (ruff I001)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: NiteshDhanpal

tests/test_temporal_obs_backend.py

@@ -15,9 +15,9 @@
 from typing import Any, cast
 
 import pytest
+from temporalio import activity as temporal_activity
 from opentelemetry import trace as otel_trace
 from opentelemetry.trace import TraceFlags, SpanContext
-from temporalio import activity as temporal_activity
 
 import agentex.lib.core.tracing.trace as trace_mod
 import agentex.lib.core.tracing.obs_ids as obs_ids_mod