CI: Update workflow to use released Python 3.12.

Closes #5745

.github/workflows/ci.yml

@@ -41,7 +41,7 @@ jobs:
         #
         # FIXME: 'cpp' tests seems to fail due to compilation errors (numpy_pythran_unit)
         # in all python versions and test failures (builtin_float) in 3.5<
-        os: [windows-2019, ubuntu-20.04, macos-11]
+        os: [ubuntu-20.04, windows-2019, macos-11]
         backend: [c, cpp]
         python-version:
           - "2.7"
@@ -52,12 +52,12 @@ jobs:
           - "3.9"
           - "3.10"
           - "3.11"
-          - "3.12-dev"
+          - "3.12"
         env: [{}]
 
         include:
-          # Temporary - Allow failure on Python 3.12-dev jobs until they are in beta (feature frozen)
-          - python-version: 3.12-dev
+          # Temporary - Allow failure on Python 3.12 jobs (https://github.com/cython/cython/issues/5470)
+          - python-version: "3.12"
             allowed_failure: true
 
           # Ubuntu sub-jobs:
@@ -122,7 +122,7 @@ jobs:
             env: { LIMITED_API: "--limited-api", EXCLUDE: "--no-file" }
             extra_hash: "-limited_api"
           - os: ubuntu-20.04
-            python-version: "3.12-dev"
+            python-version: "3.12"
             allowed_failure: true
             backend: "c,cpp"
             env: { LIMITED_API: "--limited-api", EXCLUDE: "--no-file" }