ci: Fix pre-commit hook stages

Default to the two actually relevant hook stages ('commit' and
'merge-commit'), to avoid running some hooks multiple times if
pre-commit is installed globally.

While we're here, also remove the versioneer-specific exclusions. We
haven't been using versioneer for a while now and currently don't plan
on going back to it.

.pre-commit-config.yaml

@@ -1,7 +1,8 @@
 # SPDX-FileCopyrightText: 2022 Copyright DB InfraGO AG and the capellambse-context-diagrams contributors
 # SPDX-License-Identifier: CC0-1.0
 
-exclude: '^(versioneer\.py|.*/_version\.py)$'
+default_install_hook_types: [commit-msg, pre-commit]
+default_stages: [commit, merge-commit]
 repos:
   - repo: https://github.com/pre-commit/pre-commit-hooks
     rev: v4.6.0