Unpin initial version of python3-pip as versions quickly become una…

…vailable.

We subsequently upgrade to a specific later version anyway.

PiperOrigin-RevId: 588344280

Dockerfile

@@ -10,7 +10,7 @@ ARG DEBIAN_FRONTEND=noninteractive
 RUN apt-get install -y python3.9=3.9.5-3ubuntu0~20.04.1
 
 # Install pip.
-RUN apt-get install -y python3-pip=20.0.2-5ubuntu1.9
+RUN apt-get install -y python3-pip
 RUN python3.9 -m pip install --upgrade pip==22.1.2
 
 # Install wget and unrar to download and extract ROMs.

dqn_zoo/replay_test.py

@@ -1006,6 +1006,7 @@ def test_set_cannot_add_negative_nan_or_inf_values(self):
       sum_tree.set([1], [np.inf])
 
   def test_set_all_cannot_add_negative_nan_or_inf_values(self):
+
     with self.assertRaises(ValueError):
       replay_lib.SumTree().set_all([1, -1])