CI: Fix executable perms for various files

.pre-commit-config.yaml

@@ -10,6 +10,13 @@ exclude: |
   )$
 
 repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v6.0.0
+    hooks:
+      - id: check-executables-have-shebangs
+      - id: check-shebang-scripts-are-executable
+        exclude: (SConstruct|SCsub)$ # SCons files use shebangs for syntax highlighting only.
+
   - repo: https://github.com/pre-commit/mirrors-clang-format
     rev: v21.1.7
     hooks: