pre-commit: install gst-indent through pip

Depends on: https://gitlab.freedesktop.org/gstreamer/gst-indent/-/merge_requests/13

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8402>

.pre-commit-config.yaml

@@ -19,6 +19,7 @@ repos:
         entry: ./scripts/gst-indent-all.py
         pass_filenames: false
         types_or: ["c", "c++"]
+        additional_dependencies: ["gst-indent==1.0.0"]
     # The rust hook uses cargo fmt, which requires a Cargo.toml
     # We use a local hook to run rustfmt directly
     -   id: rustfmt