Temporary disable Python 3.12 tests

- pathlib implementation has changed, fake pathlib
  has to be adapted first
  (see #770)

Author: mrbean-bremen

.github/workflows/testsuite.yml

@@ -10,7 +10,8 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macOS-latest, windows-latest]
-        python-version: [3.7, 3.8, 3.9, "3.10", "3.11", "3.12-dev"]
+        python-version: [3.7, 3.8, 3.9, "3.10", "3.11"]
+#        python-version: [3.7, 3.8, 3.9, "3.10", "3.11", "3.12-dev"]
         include:
           - python-version: "pypy-3.7"
             os: ubuntu-latest