CI: Change range of python versions from 2.7-3.10 to 3.8-3.10

Since python no longer supports 2.7-3.7, we drop testing on these
versions too. GHA no longer supports running on some of these
versions.

Author: scottclowe

.github/workflows/test-release-candidate.yaml

@@ -52,14 +52,12 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest]
-        python-version: ["3.5", "3.6", "3.7", "3.8", "3.9", "3.10"]
+        python-version: ["3.8", "3.9", "3.10"]
         include:
-          - os: ubuntu-latest
-            python-version: "2.7"
           - os: macos-latest
-            python-version: "3.5"
+            python-version: "3.8"
           - os: macos-latest
-            python-version: "3.9"
+            python-version: "3.10"
     env:
       OS: ${{ matrix.os }}
       PYTHON: ${{ matrix.python-version }}

.github/workflows/test.yaml

@@ -27,7 +27,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python-version: ["2.7", "3.5", "3.10"]
+        python-version: ["3.8", "3.10"]
         include:
           - os: windows-latest
             python-version: "3.10"