drop PyPy from CI matrix

Author: skshetry

.github/workflows/tests.yml

@@ -22,8 +22,6 @@ jobs:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
         pyv: ['3.9', '3.10', '3.11', '3.12', '3.13', '3.14']
-        include:
-        - {os: ubuntu-latest, pyv: 'pypy3.9'}
 
     steps:
     - name: Check out the repository