dev(pre-commit): bump hook versions

Author: Brooke-white

.pre-commit-config.yaml

@@ -1,21 +1,21 @@
 repos:
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v2.3.0
+    rev: v3.4.0
     hooks:
       - id: check-yaml
       - id: end-of-file-fixer
       - id: trailing-whitespace
   - repo: https://github.com/pre-commit/mirrors-isort
-    rev: v5.1.0 # must be >5.0.0 for black compatibility
+    rev: v5.8.0 # must be >5.0.0 for black compatibility
     hooks:
       - id: isort
         args: ["--profile", "black", "."]
   - repo: https://github.com/ambv/black
-    rev: stable
+    rev: 20.8b1
     hooks:
       - id: black
   - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v0.790
+    rev: v0.812
     hooks:
       - id: mypy
         verbose: true