fix failing lint github actions job due to issue w/ isort version (gr…

…afana#1249)

# What this PR does

## Which issue(s) this PR fixes

`lint` github action jobs on all builds are failing right now
([example](https://github.com/grafana/oncall/actions/runs/4042567074/jobs/6950923821#step:6:16))
because of [this issue](PyCQA/isort#2077) with
`isort`

## Checklist

- [ ] Tests updated
- [ ] Documentation added
- [ ] `CHANGELOG.md` updated

.pre-commit-config.yaml

@@ -1,6 +1,6 @@
 repos:
   - repo: https://github.com/pycqa/isort
-    rev: 5.9.3
+    rev: 5.12.0
     hooks:
       - id: isort
         files: ^engine