Fix test_errors_in_xfail_skip_expressions for Python 3.10.1

Decided to remove the condition altogether as seems reasonable to state
that our own test suite requires Python 3.10.1.

Fix #9413

Author: nicoddemus

.github/workflows/main.yml

@@ -78,7 +78,7 @@ jobs:
             os: windows-latest
             tox_env: "py39-xdist"
           - name: "windows-py310"
-            python: "3.10-dev"
+            python: "3.10.1"
             os: windows-latest
             tox_env: "py310-xdist"
 
@@ -108,7 +108,7 @@ jobs:
             os: ubuntu-latest
             tox_env: "py39-xdist"
           - name: "ubuntu-py310"
-            python: "3.10-dev"
+            python: "3.10.1"
             os: ubuntu-latest
             tox_env: "py310-xdist"
           - name: "ubuntu-pypy3"

testing/test_skipping.py

@@ -1143,8 +1143,6 @@ def test_func():
     pypy_version_info = getattr(sys, "pypy_version_info", None)
     if pypy_version_info is not None and pypy_version_info < (6,):
         markline = markline[5:]
-    elif sys.version_info[:2] >= (3, 10):
-        markline = markline[11:]
     elif sys.version_info >= (3, 8) or hasattr(sys, "pypy_version_info"):
         markline = markline[4:]