TST/MAINT: Remove PyPy2.7 from CI matrix

Author: Kai-Striega

.github/workflows/pythonpackage.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", 'pypy2.7', 'pypy3.7', 'pypy3.8', 'pypy3.9']
+        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", 'pypy3.7', 'pypy3.8', 'pypy3.9']
 
     steps:
     - uses: actions/checkout@v3