CI: Re-add PyPy 3.7 for platforms that still have it.

Author: scoder

.github/workflows/ci.yml

@@ -25,6 +25,7 @@ jobs:
           - "3.7"
           - "3.6"
           - "pypy-2.7"
+          - "pypy-3.7"
           - "pypy-3.8"
           - "pypy-3.9"
           - "pypy-3.10"
@@ -56,6 +57,8 @@ jobs:
             python-version: "3.6"
           - os: macos-latest
             python-version: "3.7"
+          - os: macos-latest
+            python-version: pypy-3.7
 
           - os: macos-11
             lua-version: lua5.2