chore: require pytest 6 consistently (#5599)

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

Author: henryiii

tests/pytest.ini

@@ -1,5 +1,5 @@
 [pytest]
-minversion = 3.10
+minversion = 6
 norecursedirs = test_* extra_*
 xfail_strict = True
 addopts =

tests/requirements.txt

@@ -8,7 +8,7 @@ numpy~=1.21.5; platform_python_implementation=="CPython" and python_version>="3.
 numpy~=1.22.2; platform_python_implementation=="CPython" and python_version=="3.10"
 numpy~=1.26.0; platform_python_implementation=="CPython" and python_version>="3.11" and python_version<"3.13"
 numpy~=2.2.0; platform_python_implementation=="CPython" and python_version=="3.13"
-pytest>=7
+pytest>=6
 pytest-timeout
 scipy~=1.5.4; platform_python_implementation=="CPython" and python_version<"3.10"
 scipy~=1.8.0; platform_python_implementation=="CPython" and python_version=="3.10" and sys_platform!="win32"