Fixed PIP version

fixed pip install to 20.3.4 bc latest one
(21.0.0) breaks python build

Change-Id: I0266509ad07d0d28c509b446f40cabc7ca7ab8ef
Signed-off-by: smarcet <smarcet@gmail.com>

files/functions

@@ -66,7 +66,7 @@ function set_python_venv {
     cd $target_dir/app/Console/Commands/SpammerProcess
     python3 -m venv env
     source env/bin/activate
-    pip install --upgrade pip
+    pip install  "pip==20.3.4"
     pip install --upgrade setuptools
     pip install wheel
     pip install -r requirements.txt