Python 2.7 is no longer supported by actions/setup-python

Time to accept we are no longer supporting it.

.github/workflows/main.yml

@@ -73,7 +73,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["2.7", "3.8", "3.9", "3.10", "3.11", "3.12", "pypy-3.10"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "pypy-3.10"]
 
     steps:
       - uses: actions/checkout@v4