Bump requirements

Author: ollandos

.circleci/config.yml

@@ -6,7 +6,7 @@ version: 2
 jobs:
   build:
     docker:
-      - image: python:3.6
+      - image: python:3.9.1-slim-buster
     steps:
       - checkout
       - run:

requirements.txt

@@ -6,5 +6,5 @@ pyparsing==2.2.0
 six
 
 # InDesign
-lxml==4.1.1
+lxml==4.3.3
 git+git://github.com/kbairak/ucflib@py3_compatibility