ESS: Bump isort version in ESS pre-commit hook

isort v5.10.1 present compatibility issues in some environments (see
PyCQA/isort#2083 (comment)).
isort v5.12.0 seems to solve the issue.

Change-Id: Ie0d10567a9d281b211ef47f50acdd53ab55e9b6f
Reviewed-on: https://forge.frm2.tum.de/review/c/frm2/nicos/nicos/+/30758
Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de>
Reviewed-by: Jonas Petersson <jonas.petersson@ess.eu>
Reviewed-by: Jens Krueger <jens.krueger@frm2.tum.de>

nicos_ess/.pre-commit-config.yaml

@@ -6,6 +6,6 @@ repos:
     - id: yapf
       args: ['--style', '{based_on_style: pep8, indent_dictionary_value: True}', '-i']
 -   repo: https://github.com/pycqa/isort
-    rev: 5.10.1
+    rev: 5.12.0
     hooks:
     - id: isort