Fixed ruff-check to not fail when checking unit tests

Changed `ruff.toml` so `ruff` uses Python 3.13 when checking files in `tests/` and `docs/`.

Author: EGJ-Moorington

ruff.toml

@@ -1,11 +1,14 @@
 # SPDX-FileCopyrightText: 2024 Tim Cocks for Adafruit Industries
-# SPDX-FileCopyrightText: Copyright (c) 2025 EGJ Moorington
+# SPDX-FileCopyrightText: Copyright (c) 2025, 2026 EGJ Moorington
 #
 # SPDX-License-Identifier: MIT
 
 target-version = "py38"
 line-length = 100
 
+[per-file-target-version]
+"{docs,tests}/**/*.py" = "py313"
+
 [lint]
 select = ["I", "PL", "UP"]