Update isort to v5.7.0 (#9222)

This new version no longer has the problem of adding/removing a blank line in `.pyi` files, which black disagrees with. This would cause `isort` to slightly modify `.pyi` files, before `black` would subsequently modify back directly afterwards.

Relevant `isort` issue: https://github.com/pycqa/isort/issues/1284

2 files changed, 2 insertions, 1 deletions

diff --git a/changelog.d/9222.misc b/changelog.d/9222.misc
new file mode 100644

index 0000000000..37490717b3
--- /dev/null
+++ b/changelog.d/9222.misc
@@ -0,0 +1 @@
+Update `isort` to v5.7.0 to bypass a bug where it would disagree with `black` about formatting.
\ No newline at end of file
diff --git a/setup.py b/setup.py

index ddbe9f511a..99425d52de 100755
--- a/setup.py
+++ b/setup.py
@@ -96,7 +96,7 @@ CONDITIONAL_REQUIREMENTS["all"] = list(ALL_OPTIONAL_REQUIREMENTS)
 #
 # We pin black so that our tests don't start failing on new releases.
 CONDITIONAL_REQUIREMENTS["lint"] = [
-    "isort==5.0.3",
+    "isort==5.7.0",
     "black==19.10b0",
     "flake8-comprehensions",
     "flake8",