Bump min pytest to 7.0.0

Refs #1057

src/xdist/plugin.py

@@ -6,8 +6,6 @@ import warnings
 import pytest
 
 
-PYTEST_GTE_7 = hasattr(pytest, "version_tuple") and pytest.version_tuple >= (7, 0)  # type: ignore[attr-defined]
-
 _sys_path = list(sys.path)  # freeze a copy of sys.path at interpreter startup
 
 
@@ -188,16 +186,16 @@ def pytest_addoption(parser):
     parser.addini(
         "rsyncdirs",
         "list of (relative) paths to be rsynced for remote distributed testing.",
-        type="paths" if PYTEST_GTE_7 else "pathlist",
+        type="paths",
     )
     parser.addini(
         "rsyncignore",
         "list of (relative) glob-style paths to be ignored for rsyncing.",
-        type="paths" if PYTEST_GTE_7 else "pathlist",
+        type="paths",
     )
     parser.addini(
         "looponfailroots",
-        type="paths" if PYTEST_GTE_7 else "pathlist",
+        type="paths",
         help="directories to check for changes. Default: current directory.",
     )