fix: ensure that pip always gets the latest versions

Author: mattdy

uk_bin_collection_api_server/Dockerfile

@@ -9,7 +9,7 @@ COPY requirements.txt .
 
 # Install any needed packages specified in requirements.txt
 RUN apk add --no-cache gcc musl-dev libffi-dev openssl-dev \
-    && pip install --no-cache-dir -r requirements.txt \
+    && pip install --upgrade --no-cache-dir -r requirements.txt \
     && apk del gcc musl-dev libffi-dev openssl-dev
 
 # Copy the application code into the container