Update dependency pyrefly to v1.4.0 (#16600)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

requirements-tests.txt

@@ -1,7 +1,7 @@
 # Type checkers that we test our stubs against. These should always
 # be pinned to a specific version to make failure reproducible.
 mypy==2.4.0
-pyrefly==1.3.2
+pyrefly==1.4.0
 pyright==1.1.414
 ty==0.0.87