[Fix] Fix test failures and Docker build from pinned dependency upgrade

pytest-asyncio 1.x no longer provides an implicit event loop in sync
fixtures/tests. Make async-dependent fixtures and tests async, and
replace deprecated asyncio.get_event_loop() in tests. Switch
Dockerfile.build_from_pip from Alpine to Debian slim since
pyroscope-io 0.8.x has no musl wheels.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docker/build_from_pip/Dockerfile.build_from_pip

@@ -1,16 +1,14 @@
-FROM python:3.13-alpine@sha256:bb1f2fdb1065c85468775c9d680dcd344f6442a2d1181ef7916b60a623f11d40
+FROM python:3.13-slim@sha256:739e7213785e88c0f702dcdc12c0973afcbd606dbf021a589cab77d6b00b579d
 
 WORKDIR /app
 
 ENV HOME=/home/litellm
 ENV PATH="${HOME}/venv/bin:$PATH"
 
-# Install runtime dependencies
-# Note: Using Python 3.13 for compatibility with ddtrace and other packages
-# rust and cargo are required for building ddtrace from source
-# musl-dev and libffi-dev are needed for some Python packages on Alpine
-RUN apk update && \
-    apk add --no-cache gcc musl-dev libffi-dev openssl openssl-dev rust cargo
+# Install runtime dependencies needed for building native extensions
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends gcc libffi-dev && \
+    rm -rf /var/lib/apt/lists/*
 
 RUN python -m venv ${HOME}/venv
 RUN ${HOME}/venv/bin/pip install --no-cache-dir --upgrade pip==26.0.1
@@ -28,4 +26,4 @@ RUN prisma generate
 EXPOSE 4000/tcp
 
 ENTRYPOINT ["litellm"]
-CMD ["--port", "4000"]
+CMD ["--port", "4000"]

tests/test_litellm/proxy/middleware/test_in_flight_requests_middleware.py

@@ -92,7 +92,7 @@ def test_non_http_scopes_not_counted():
 
     mw = InFlightRequestsMiddleware(_InnerApp())
 
-    asyncio.get_event_loop().run_until_complete(
+    asyncio.run(
         mw({"type": "lifespan"}, None, None)  # type: ignore[arg-type]
     )
     assert get_in_flight_requests() == 0

tests/test_litellm/router_strategy/test_base_routing_strategy.py

@@ -20,7 +20,7 @@ from litellm.router_strategy.base_routing_strategy import BaseRoutingStrategy
 
 
 @pytest.fixture
-def mock_dual_cache():
+async def mock_dual_cache():
     dual_cache = MagicMock(spec=DualCache)
     dual_cache.in_memory_cache = MagicMock()
     dual_cache.redis_cache = MagicMock()
@@ -47,7 +47,7 @@ def mock_dual_cache():
 
 
 @pytest.fixture
-def base_strategy(mock_dual_cache):
+async def base_strategy(mock_dual_cache):
     return BaseRoutingStrategy(
         dual_cache=mock_dual_cache,
         should_batch_redis_writes=False,
@@ -137,7 +137,8 @@ async def test_sync_in_memory_spend_with_redis(base_strategy, mock_dual_cache):
     assert len(base_strategy.in_memory_keys_to_update) == 1
 
 
-def test_cache_keys_management(base_strategy):
+@pytest.mark.asyncio
+async def test_cache_keys_management(base_strategy):
     # Test adding and getting cache keys
     base_strategy.add_to_in_memory_keys_to_update("key1")
     base_strategy.add_to_in_memory_keys_to_update("key2")