ci: exclude binary GP files from end-of-file-fixer + trim gpif.py trailing blank

The pre-commit `end-of-file-fixer` and `trailing-whitespace` hooks
treat binary Guitar Pro files (.gp, .gp3..gp8, .gpx, .tmp) as text
and report spurious "files modified" failures on every CI run.

Add an exclude pattern covering all GP binary extensions so the hooks
only act on real text sources.

Also drop the extra trailing newline at the end of `src/guitarpro/gpif.py`
that the same hook flagged.

Author: kaizenman

.pre-commit-config.yaml

@@ -15,4 +15,6 @@ repos:
     rev: v6.0.0
     hooks:
       - id: trailing-whitespace
+        exclude: '\.(gp|gp3|gp4|gp5|gp7|gp8|gpx|tmp)$'
       - id: end-of-file-fixer
+        exclude: '\.(gp|gp3|gp4|gp5|gp7|gp8|gpx|tmp)$'

src/guitarpro/gpif.py

@@ -2640,4 +2640,3 @@ def _empty_beat(voice: gp.Voice) -> gp.Beat:
         beat.status = gp.BeatStatus.empty
         beat.notes = []
         return beat
-