Drop Python 3.8 in GitHub actions; add more 3.12

This overall drops one OS/version combination.
Could be leaner and mainly use older and newest
rather than three version?

.github/workflows/ci.yml

@@ -63,7 +63,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.8", "3.10", "3.11"]
+        python-version: ["3.9", "3.11", "3.12"]
 
     steps:
     - uses: actions/checkout@v4
@@ -116,7 +116,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-2019]
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
 
     runs-on: ${{ matrix.os }}
 
@@ -166,7 +166,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.8", "3.10", "3.11"]
+        python-version: ["3.9", "3.11", "3.12"]
 
     steps:
 
@@ -215,7 +215,7 @@ jobs:
     runs-on: macos-latest
     strategy:
       matrix:
-        python-version: ["3.8", "3.12"]
+        python-version: ["3.9", "3.12"]
 
     steps:
     - uses: actions/checkout@v4
@@ -253,7 +253,7 @@ jobs:
       matrix:
         # TODO - Try Python 3.11 again, was Python 3.11.0 was
         # failing when trying to delete SQlite databases.
-        python-version: ["3.8", "3.10", "3.12"]
+        python-version: ["3.9", "3.10", "3.12"]
 
     steps:
     - uses: actions/checkout@v4