chore: Drop unnecessary __future__.annotations import in test runner

`from __future__ import annotations` is useful in importable packages to
enable postponed evaluation of annotations. However, in a standalone
script like `run-tests.py`, it adds no value.

Author: jcfr

run-tests.py

@@ -1,5 +1,3 @@
-from __future__ import annotations
-
 import glob
 import os
 import shutil