ci/lint-commit-msg.py: add .rst from allowed extension skips

All .rst files changes are prefixed with DOCS/ so the ext can be skipped.

ci/lint-commit-msg.py

@@ -106,7 +106,7 @@ def line_too_long(body):
     "Prefix should not include file extension (use `vo_gpu: ...` not `vo_gpu.c: ...`)",
 )
 def no_file_exts(body):
-    return not re.search(r"[a-z0-9]\.([chm]|cpp|swift): ", body[0])
+    return not re.search(r"[a-z0-9]\.([chm]|cpp|swift|rst): ", body[0])
 
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