Made pip upgrade before copying requirements.txt in Dockerfile

Dockerfile

@@ -15,8 +15,8 @@ RUN adduser -u 1000 --disabled-password --gecos "" appuser && chown -R appuser /
 RUN apt update && apt full-upgrade -y
 
 # Install pip requirements
-COPY requirements.txt .
 RUN pip install -U pip setuptools wheel
+COPY requirements.txt .
 RUN pip install -r requirements.txt
 
 COPY . /app