CI: mark Py3.10-dev jobs as expected to succeed (for now).

.github/workflows/ci.yml

@@ -29,9 +29,10 @@ jobs:
         env: [{}]
 
         include:
-          # Temporary - Allow failure on all 3.10-dev jobs until beta comes out
-          - python-version: 3.10-dev
-            allowed_failure: true
+          # Temporary - Allow failure on all Python -dev jobs until they are considered stable
+          #- python-version: 3.10-dev
+          #  allowed_failure: true
+
           # Ubuntu sub-jobs:
           # ================
           # GCC 11