[CI] Upgrade the version of isort to fix lint error in master branch (open-mmlab#2520)

## Motivation

open-mmlab/mmeval#85

---------

Co-authored-by: Miao Zheng <[email protected]>
Co-authored-by: Zaida Zhou <[email protected]>

Author: 3 people

.pre-commit-config.yaml

@@ -3,8 +3,8 @@ repos:
     rev: 5.0.4
     hooks:
       - id: flake8
-  - repo: https://github.com/PyCQA/isort
-    rev: 5.10.1
+  - repo: https://github.com/zhouzaida/isort
+    rev: 5.12.1
     hooks:
       - id: isort
   - repo: https://github.com/pre-commit/mirrors-yapf