Lint: Normalise whitespace

Author: AA-Turner

.github/PULL_REQUEST_TEMPLATE/Mark a PEP Final.md

@@ -14,9 +14,15 @@ repos:
   - repo: https://github.com/pre-commit/pre-commit-hooks
     rev: v5.0.0
     hooks:
+      - id: end-of-file-fixer
+        name: "Ensure files end with a single newline"
       - id: mixed-line-ending
         name: "Normalize mixed line endings"
         args: [--fix=lf]
+      - id: trailing-whitespace
+        name: "Remove trailing whitespace"
+        args: ["--chars", " \t"]
+
       - id: file-contents-sorter
         name: "Sort codespell ignore list"
         files: '.codespell/ignore-words.txt'