Remove xvfb from conda environment.

environment.yaml

@@ -22,14 +22,13 @@ dependencies:
 - pytest=5.4.2
 - python=3.8.2
 - pyvirtualdisplay=0.2.5
-- redis-py=3.5.1
+- redis-py=3.5.2
 - s3fs=0.4.0
 - selenium=3.141.0
 - sentry-sdk=0.14.4
 - tabulate=0.8.7
 - tblib=1.6.0
 - wget=1.20.1
-- xorg-x11-server-xvfb-cos6-x86_64=1.17.4
 - pip:
   - amazon-kclpy==2.0.1
   - crontab==0.22.6

scripts/environment-unpinned.yaml

@@ -24,7 +24,6 @@ dependencies:
     - tabulate
     - tblib
     - wget
-    - xorg-x11-server-xvfb-cos6-x86_64
     - pip:
       - plyvel
       - domain-utils