chore(ci): move tests back to github runner (#561)

* chore(ci): upgrade Python version in GitHub Actions workflow to 3.12
* chore(ci): change GitHub Actions runner to ubuntu-latest for improved compatibility

Author: eliteprox

.github/workflows/test.yaml

@@ -56,8 +56,7 @@ jobs:
 
   test:
     name: Run Tests
-    runs-on: [self-hosted, linux, amd64]
-    # self-hosted runner provides enough disk space for the full test suite
+    runs-on: ubuntu-latest
     steps:
       - name: Check out code
         uses: actions/checkout@v6
@@ -69,7 +68,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v6
         with:
-          python-version: '3.12.x'
+          python-version: '3.12'
           cache: pip
 
       - name: Install dependencies