Run pre-commit autoupdate, pinning flake8 at 5.0.4

`flake8` 6.0.0 requires Python >= 3.8.  Python 3.7 goes EOL on
2023-06-27, so we will stay with flake8 < 6.0.0 until then.

The `flake8` issue was previously seen in case-prov PR 55.

References:
* casework/CASE-Implementation-PROV-O#55
* https://www.python.org/downloads/
* https://peps.python.org/pep-0537/

Signed-off-by: Alex Nelson <alexander.nelson@nist.gov>

Author: ajnelson-nist

.pre-commit-config.yaml

@@ -1,10 +1,10 @@
 repos:
   - repo: https://github.com/psf/black
-    rev: 22.3.0
+    rev: 22.10.0
     hooks:
       - id: black
   - repo: https://github.com/pycqa/flake8
-    rev: 4.0.1
+    rev: 5.0.4
     hooks:
       - id: flake8
   - repo: https://github.com/pycqa/isort