Merge "Bump requests minimal version"

Author: Zuul

requirements.txt

@@ -12,5 +12,5 @@ osc-lib>=2.3.0 # Apache-2.0
 oslo.i18n>=3.15.3 # Apache-2.0
 python-keystoneclient>=3.22.0 # Apache-2.0
 python-cinderclient>=3.3.0 # Apache-2.0
-requests>=2.14.2 # Apache-2.0
+requests>=2.27.0 # Apache-2.0
 stevedore>=2.0.1 # Apache-2.0