fix: stabilize summarizer docker build on production hosts

tools/summarizer/Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.11-slim
+FROM python:3.11
 ENV PIP_NO_CACHE_DIR=1 \
     PIP_DISABLE_PIP_VERSION_CHECK=1 \
     PYTHONUNBUFFERED=1 \
@@ -6,9 +6,8 @@ ENV PIP_NO_CACHE_DIR=1 \
     HF_HUB_DISABLE_TELEMETRY=1
 WORKDIR /app
 COPY requirements.txt ./
-RUN pip install --upgrade pip setuptools wheel \
-    && pip install --extra-index-url https://download.pytorch.org/whl/cpu torch==2.5.1 \
-    && pip install -r requirements.txt
+RUN python -m pip install --upgrade pip setuptools wheel \
+    && python -m pip install --extra-index-url https://download.pytorch.org/whl/cpu -r requirements.txt
 COPY . .
 EXPOSE 8001
 CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "8001"]