Bump flake8-import-order to 0.19.x

needed to work with setuptools > 81 as pkg_resources was
finally removed from setuptools.

Related-Issue: PRODX-3456
Change-Id: I3047013308817ce00dad12729e6aaf5e7c67c253
diff --git a/test-requirements.txt b/test-requirements.txt
index ebde755..6c93446 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,7 +1,7 @@
 hacking>=6.1.0,<6.2.0 # Apache-2.0
 
 coverage>=4.4.1 # Apache-2.0
-flake8-import-order>=0.18.0,<0.19.0 # LGPLv3
+flake8-import-order>=0.19.0,<0.20.0 # LGPLv3
 python-subunit>=1.0.0 # Apache-2.0/BSD
 oslotest>=3.2.0 # Apache-2.0
 stestr>=1.0.0 # Apache-2.0