Update pytest-variables from 1.5.1 to 1.6.0 (#2424)

requirements/dev.txt

@@ -81,5 +81,7 @@ selenium==3.4.0 \
     --hash=sha256:49d904b59016c5defa7818433b2477b769c53118be2b1a4152a0c5b5f65dffb4
 pytest-html==1.14.2 --hash=sha256:899d59d3e70f141ebf93b25b31e9d7c0a18469259cec3edaa3686f1d85b06c13
 pytest-metadata==1.3.0 --hash=sha256:b8735ad24a4974b35ca2d37a443596a26e0986754b0841c46231f4a6f6fa92c9
-pytest-variables==1.5.1 --hash=sha256:8f2b7c16c54bfe93561c7a36a5e9d8780bdcd36e6e37d9f7b3b51b656449e2ea
+pytest-variables==1.6.0 \
+    --hash=sha256:49f296b9ca306bd575372f1fbe907ebf930499ec35b2f35b901a914ca820bba3 \
+    --hash=sha256:93bbd9179a45c737c0d2f9320668df1af5fc12a54ad24256f4ec9863aa78cd4a
 pytest-base-url==1.3.0 --hash=sha256:3e1d40d2826c2d848b31355502815250ad4035e5bfb4e3ad0405b2d6fad874f4