Revert "Try adding mypy self check on PyPy to CI" (python#11365)

This reverts commit caae446.

Author: emmatyping

.github/workflows/test.yml

@@ -80,11 +80,6 @@ jobs:
           arch: x64
           os: ubuntu-latest
           toxenv: type
-        - name: Type check our own code (on pypy)
-          python: 'pypy-3.8'
-          arch: x64
-          os: ubuntu-latest
-          toxenv: type-pypy
         - name: Code style with flake8
           python: '3.7'
           arch: x64

tox.ini

@@ -53,12 +53,6 @@ commands =
     python -m mypy --config-file mypy_self_check.ini -p mypy -p mypyc
     python -m mypy --config-file mypy_self_check.ini misc/proper_plugin.py scripts/mypyc
 
-[testenv:type-pypy]
-description = type check ourselves (on PyPy!)
-basepython = pypy-3.8
-commands =
-    python -m mypy --config-file mypy_self_check.ini -p mypy
-
 [testenv:docs]
 description = invoke sphinx-build to build the HTML docs
 basepython = python3.7