pre-commit: Remove proselint.

It seems unmaintained. It fails to install on Python 3.12 and the domain
name hasn't been renewed.

.pre-commit-config.yaml

@@ -26,13 +26,6 @@ repos:
     hooks:
       - id: detect-secrets
 
-  - repo: https://github.com/amperser/proselint.git
-    rev: 0.14.0
-    hooks:
-      - id: proselint
-        types: [plain-text]
-        exclude: LICENSE
-
   - repo: https://gitlab.com/devopshq/gitlab-ci-linter.git
     rev: v1.0.6
     hooks: