don't publish to pypi on 3.12 just yet

Author: maxbelanger

.github/workflows/pypiupload.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        python-version: [2.7, 3.x]
+        python-version: [2.7, 3.7]
 
     steps:
     - uses: actions/checkout@v2.3.4
@@ -34,9 +34,9 @@ jobs:
     - name: Build
       run: |
         python setup.py bdist_wheel
-    - name: Build Sources (3.x)
+    - name: Build Sources (Python 3)
       run: python setup.py sdist
-      if: matrix.python-version == '3.x'
+      if: ${{ matrix.python-version != '2.7' }}
     - name: Publish
       env:
         TWINE_USERNAME: __token__