ci(pre-commit): Migrate from qmlformat to qml_formatter

Although `qml_formatter` is much less mature, we can at least pin a
specific version via pre-commit. This is especially important since
`qmlformat` seems to change its formatting rules on every version bump,
so version incompatibilities between local computer and CI happen very
often.

.pre-commit-config.yaml

@@ -115,6 +115,10 @@ repos:
     hooks:
       - id: prettier
         types: [yaml]
+  - repo: https://github.com/Holzhaus/qml_formatter.git
+    rev: ee56e6adb31499f9003bd3419078c42ff6b204ed
+    hooks:
+      - id: qml_formatter
   - repo: local
     hooks:
       - id: qsscheck
@@ -138,13 +142,6 @@ repos:
         language: python
         types: [text]
         files: ^CHANGELOG.md$
-      - id: qmlformat
-        name: qmlformat
-        entry: tools/qmlformat.py
-        pass_filenames: true
-        language: system
-        types: [text]
-        files: ^.*\.qml$
       - id: qmllint
         name: qmllint
         entry: qmllint