Add pytest-xdist to project requirements

Author: dagpunk

requirements.in

@@ -1,2 +1,3 @@
 pylint==2.12.2
 pytest==7.0.1
+pytest-xdist==2.5.0

requirements.txt

@@ -1,5 +1,5 @@
 #
-# This file is autogenerated by pip-compile with python 3.9
+# This file is autogenerated by pip-compile with python 3.8
 # To update, run:
 #
 #    pip-compile
@@ -8,6 +8,8 @@ astroid==2.9.0
     # via pylint
 attrs==21.2.0
     # via pytest
+execnet==1.9.0
+    # via pytest-xdist
 iniconfig==1.1.1
     # via pytest
 isort==5.10.1
@@ -23,17 +25,30 @@ platformdirs==2.4.0
 pluggy==1.0.0
     # via pytest
 py==1.11.0
-    # via pytest
+    # via
+    #   pytest
+    #   pytest-forked
 pylint==2.12.2
     # via -r requirements.in
 pyparsing==3.0.6
     # via packaging
 pytest==7.0.1
+    # via
+    #   -r requirements.in
+    #   pytest-forked
+    #   pytest-xdist
+pytest-forked==1.4.0
+    # via pytest-xdist
+pytest-xdist==2.5.0
     # via -r requirements.in
 toml==0.10.2
     # via pylint
 tomli==2.0.1
     # via pytest
+typing-extensions==4.1.1
+    # via
+    #   astroid
+    #   pylint
 wrapt==1.13.3
     # via astroid