Minor updates in Dockerfile

Change-Id: Ia12406fef38b13c56ebec3be5bee53cd00441181
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/Dockerfile b/Dockerfile
index 52c2c21..27ab273 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -38,10 +38,8 @@
         python3-all \
         python3-dev \
         python3-setuptools \
-        python3-pip
-
-RUN python3 -m pip install -U pip==23.1
-RUN pip install tox
+        python3-pip \
+        tox
 
 ENV LC_ALL C.UTF-8
 ENV LANG C.UTF-8