add 3.12 on gha

Author: gawel

.github/workflows/tox.yml

@@ -9,7 +9,7 @@ jobs:
       MOZ_HEADLESS: "1"
     strategy:
       matrix:
-        python: [3.7, 3.8, 3.9, "3.10", 3.11]
+        python: [3.7, 3.8, 3.9, "3.10", 3.11, 3.12]
 
     steps:
       - name: Setup firefox
@@ -37,7 +37,7 @@ jobs:
     runs-on: windows-latest
     strategy:
       matrix:
-        python: [3.7, 3.8, 3.9, "3.10", 3.11]
+        python: [3.7, 3.8, 3.9, "3.10", 3.11, 3.12]
 
     steps:
       - uses: actions/checkout@v3
@@ -54,7 +54,7 @@ jobs:
     runs-on: macos-latest
     strategy:
       matrix:
-        python: [3.7, 3.8, 3.9, "3.10", 3.11]
+        python: [3.7, 3.8, 3.9, "3.10", 3.11, 3.12]
 
     steps:
       - uses: actions/checkout@v3