make sure pip is upgraded (#3401)

At the beginning of installs

tasks.py

@@ -105,6 +105,7 @@ def install(c):
     print("Installing required python packages from 'requirements.txt'")
 
     # Install required Python packages with PIP
+    c.run('pip3 install --upgrade pip')
     c.run('pip3 install --no-cache-dir --disable-pip-version-check -U -r requirements.txt')