Update pytest from 4.1.0 to 4.1.1 (#4454)

requirements/dev.txt

@@ -1,8 +1,8 @@
 # Dependencies needed only for development/testing.
 
-pytest==4.1.0 \
-    --hash=sha256:3e65a22eb0d4f1bdbc1eacccf4a3198bf8d4049dea5112d70a0c61b00e748d02 \
-    --hash=sha256:5924060b374f62608a078494b909d341720a050b5224ff87e17e12377486a71d
+pytest==4.1.1 \
+    --hash=sha256:41568ea7ecb4a68d7f63837cf65b92ce8d0105e43196ff2b26622995bb3dc4b2 \
+    --hash=sha256:c3c573a29d7c9547fb90217ece8a8843aa0c1328a797e200290dc3d0b4b823be
 
 django-debug-toolbar==1.11 \
     --hash=sha256:c2b0134119a624f4ac9398b44f8e28a01c7686ac350a12a74793f3dd57a9eea0 \