Fix stestr version on 2.6.0
Since there is a 3.0.0 version of stestr released
that drops Python 2 support, it is needed to fix version
Change-Id: Idee5b8059221d9e8c362d4fd9e93039123be8d88
Related-PROD: PROD-35031
diff --git a/requirements.txt b/requirements.txt
index 76db574..228983f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,7 +10,7 @@
oslo.concurrency>=3.25.0 # Apache-2.0
oslo.config>=5.1.0 # Apache-2.0
oslo.log>=3.36.0 # Apache-2.0
-stestr>=1.0.0 # Apache-2.0
+stestr<3.0.0 # Apache-2.0
oslo.serialization!=2.19.1,>=2.18.0 # Apache-2.0
oslo.utils>=3.33.0 # Apache-2.0
six>=1.10.0 # MIT