Flush output in sanity requirements update script. (#79774)

This keeps the subprocess output under the correct heading.

1 files changed, 1 insertions, 1 deletions

diff --git a/hacking/update-sanity-requirements.py b/hacking/update-sanity-requirements.py
index 747f058880..88569af17a 100755
--- a/hacking/update-sanity-requirements.py
+++ b/hacking/update-sanity-requirements.py
@@ -83,7 +83,7 @@ def main() -> None:
     tests = [test for test in tests if test.name in test_names] if test_names else tests
 
     for test in tests:
-        print(f'===[ {test.name} ]===')
+        print(f'===[ {test.name} ]===', flush=True)
         test.freeze_requirements()