require at least pytest >= 7.0.0, fixes issue with monkeypath.setenv in autouse=True fixture

Fixes https://github.com/fonttools/fonttools/issues/3078

setup.cfg

@@ -31,7 +31,7 @@ formats = zip
 license_files = LICENSE
 
 [tool:pytest]
-minversion = 3.0
+minversion = 7.0.0
 testpaths = 
 	Tests
 	fontTools

tox.ini

@@ -16,7 +16,7 @@ download = true
 install_command = python -m pip install --only-binary=lxml {opts} {packages}
 deps =
     cov: coverage>=4.3
-    pytest
+    pytest>=7.0.0
     pytest-randomly
     # add -noextra to tox -e to skip installing extras and only test the core fonttools
     !noextra: -rrequirements.txt