[gha] change pypy-3.8 runner to pypy3 runner

Author: chrissimpkins

.github/workflows/linuxci.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10", "pypy-3.8"]
+        python-version: ["3.7", "3.8", "3.9", "3.10", "pypy3"]
     name: Linux CI
     steps:
       - name: Check out source repository

.github/workflows/macosci.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: macos-latest
     strategy:
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10", "pypy-3.8"]
+        python-version: ["3.7", "3.8", "3.9", "3.10", "pypy3"]
     name: macOS CI
     steps:
       - name: Check out source repository

.github/workflows/windowsci.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: windows-latest
     strategy:
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10", "pypy-3.8"]
+        python-version: ["3.7", "3.8", "3.9", "3.10", "pypy3"]
     name: Windows CI
     steps:
       - name: Check out source repository