Runs pyupgrade to Python 3.8+ and adds a hook for it

.pre-commit-config.yaml

@@ -37,7 +37,7 @@ repos:
         exclude: "(^Pipfile\\.lock$)"
   # Python hooks
   - repo: https://github.com/asottile/reorder_python_imports
-    rev: v3.0.1
+    rev: v3.1.0
     hooks:
       - id: reorder-python-imports
         exclude: "(migrations)"
@@ -62,6 +62,13 @@ repos:
     rev: 22.3.0
     hooks:
       - id: black
+  - repo: https://github.com/asottile/pyupgrade
+    rev: v2.32.1
+    hooks:
+      - id: pyupgrade
+        exclude: "(migrations)"
+        args:
+          - "--py38-plus"
   # Dockerfile hooks
   - repo: https://github.com/AleksaC/hadolint-py
     rev: v2.10.0