Drop PyPy support which seems to be incompatible with type annotations in modern Django

Author: philipstarkey

.github/workflows/ci.yml

@@ -18,8 +18,6 @@ jobs:
           - "3.10"
           - "3.11"
           - "3.12"
-          - "pypy-3.9"
-          - "pypy-3.10"
         tox-env:
           - "dj42" # LTS
           - "dj50"
@@ -29,8 +27,6 @@ jobs:
             tox-env: "dj50"
           - python-version: "3.9"
             tox-env: "dj50"
-          - python-version: "pypy-3.9"
-            tox-env: "dj50"
 
     env:
       TOXENV: ${{ matrix.tox-env }}