Update pytest-xdist to 1.18.2 (#6039)

requirements/dev.txt

@@ -46,8 +46,8 @@ pytest-cache==1.0 \
 pytest-django==3.1.2 \
     --hash=sha256:038ccc5a9daa1b1b0eb739ab7dce54e495811eca5ea3af4815a2a3ac45152309 \
     --hash=sha256:00995c2999b884a38ae9cd30a8c00ed32b3d38c1041250ea84caf18085589662
-pytest-xdist==1.18.1 \
-    --hash=sha256:346ae327f12be3747fb273652cf393fab7373536d7fadee6c44c76fa42ede423
+pytest-xdist==1.18.2 \
+    --hash=sha256:10468377901b80255cf192c4603a94ffe8b1f071f5c912868da5f5cb91170dae
 freezegun==0.3.9 \
     --hash=sha256:8842688de9497c82ecb40c30274ecc676e97ac78765b0ade105a97063d5b7a11 \
     --hash=sha256:783ccccd7f60968bfe49ad9e114c18ea2b63831faaaf61c1f1f71ddfde1c0eee

tests/ui/requirements.txt

@@ -5,5 +5,5 @@ pytest==3.1.3
 pytest-instafail==0.3.0
 pytest-selenium==1.11.0
 pytest-variables==1.6.1
-pytest-xdist==1.18.1
+pytest-xdist==1.18.2
 selenium==3.4.3