Update pytest-xdist to 3.8.0 (home-assistant#147943)

Author: cdce8p

requirements_test.txt

@@ -29,7 +29,7 @@ pytest-sugar==1.0.0
 pytest-timeout==2.4.0
 pytest-unordered==0.7.0
 pytest-picked==0.5.1
-pytest-xdist==3.7.0
+pytest-xdist==3.8.0
 pytest==8.4.0
 requests-mock==1.12.1
 respx==0.22.0