Move flake8 as a pre-commit local target.

The goal here is to avoid conflicts between flake8 and hacking version
each 2 days.

Inspired from nova's approach[1].

The flake8 version to install will be determined by hacking and
requirements [2] will stay aligned instead of relying on different
versions.

[1] https://opendev.org/openstack/nova/src/branch/master/.pre-commit-config.yaml#L26-L35
[2] https://opendev.org/openstack/hacking/src/branch/master/requirements.txt#L1

Change-Id: I402e708832395d95b04a5b956a19d5cc8c3f1c1f

.pre-commit-config.yaml

@@ -9,7 +9,7 @@ default_language_version:
 
 repos:
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: 9136088a246768144165fcc3ecc3d31bb686920a # v3.3.0
+    rev: 9136088a246768144165fcc3ecc3d31bb686920a  # v3.3.0
     hooks:
       - id: trailing-whitespace
       # Replaces or checks mixed line ending
@@ -27,9 +27,13 @@ repos:
       - id: debug-statements
       - id: check-yaml
         files: .*\.(yaml|yml)$
-  - repo: https://gitlab.com/pycqa/flake8
-    rev: fb91b994ed4adf4f2b4890e7bdba82f57e3a81df # 3.8.4
+  - repo: local
     hooks:
       - id: flake8
+        name: flake8
         additional_dependencies:
           - hacking>=3.1.0,<4.0
+        language: python
+        entry: flake8
+        files: '^.*\.py$'
+        exclude: '^(doc|releasenotes|tools)/.*$'