"Update ruff pre-commit hook

"

Author: FoamyGuy

.pre-commit-config.yaml

@@ -10,7 +10,7 @@ repos:
       - id: end-of-file-fixer
       - id: trailing-whitespace
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.3.4
+    rev: v0.15.8
     hooks:
       - id: ruff-format
       - id: ruff

adafruit_tlc5947.py

@@ -240,7 +240,7 @@ def __getitem__(self, key: int) -> int:
         max depends on the number of boards.
         """
         if key < 0:  # allow reverse adressing with negative index
-            key = key + _CHANNELS * self._n
+            key += _CHANNELS * self._n
         return self._get_gs_value(key)  # does parameter checking
 
     def __setitem__(self, key: int, val: int) -> None:
@@ -251,5 +251,5 @@ def __setitem__(self, key: int, val: int) -> None:
         the chip with the new PWM state.
         """
         if key < 0:  # allow reverse adressing with negative index
-            key = key + _CHANNELS * self._n
+            key += _CHANNELS * self._n
         self._set_gs_value(key, val)  # does parameter checking