[dep] Update websocket-client and attrs to major releases

Changes

• websocket-client contains mostly Py2 drop:
  • https://github.com/websocket-client/websocket-client/blob/master/ChangeLog
• attrs contains Backward-incompatible Changes which doesn’t seem to concern DuniterPy:
  • https://github.com/python-attrs/attrs/blob/main/CHANGELOG.rst
• categorize deps: network, parsing, crypto
• CI: Define extends on a one-liner

websocket-client project revival

That's a good news, a new contributor took over the maintenance on websocket-client project. I felt the project unmaintained when we decided to go with it. It seems it's really moving forward:

• https://github.com/websocket-client/websocket-client/issues/684

.gitlab-ci.yml

@@ -28,36 +28,31 @@ image: $DOCKER_IMAGE/$PYTHON_VERSION:latest
       - pyproject.toml
 
 format:
-  extends:
-    - .code_changes
+  extends: .code_changes
   stage: checks
   script:
     - black --check duniterpy tests examples
 
 build:
-  extends:
-    - .changes
+  extends: .changes
   stage: checks
   script:
     - poetry build
 
 isort:
-  extends:
-    - .code_changes
+  extends: .code_changes
   stage: checks
   script:
     - isort --check duniterpy tests examples
 
 type:
-  extends:
-    - .code_changes
+  extends: .code_changes
   stage: checks
   script:
     - mypy duniterpy tests examples --ignore-missing-imports
 
 lint:
-  extends:
-    - .code_changes
+  extends: .code_changes
   stage: checks
   tags: [redshift]
   script: