ci: bump + flake8 + isort args

- bump black, pyupgrade
- flake8 comprehensions
- remove isort args that are no longer needed

.pre-commit-config.yaml

@@ -1,21 +1,23 @@
 repos:
 -   repo: https://github.com/psf/black
-    rev: 20.8b1
+    rev: 21.4b0
     hooks:
     - id: black
 -   repo: https://github.com/pycqa/isort
     rev: 5.8.0
     hooks:
       - id: isort
         files: '.*'
-        args: [ --profile=black, --project=popmon, --thirdparty histogrammar, --thirdparty pybase64 ]
+        args: [ --profile=black, --project=popmon ]
 -   repo: https://github.com/PyCQA/flake8
     rev: "3.9.1"
     hooks:
     -   id: flake8
-        args: [ "--select=E9,F63,F7,F82"]
+        additional_dependencies:
+            - flake8-comprehensions
+        args: [ "--select=E9,F63,F7,F82,C4"]
 -   repo: https://github.com/asottile/pyupgrade
-    rev: v2.12.0
+    rev: v2.13.0
     hooks:
     -   id: pyupgrade
         args: ['--py36-plus','--exit-zero-even-if-changed']