CI: bump the minimum Python version we test with from 3.8 to 3.9

Author: dnicolodi

.cirrus.yml

@@ -55,12 +55,12 @@ manylinux-python3.13t_task:
     PATH: "/opt/python/cp313-cp313t/bin/:${PATH}"
   << : *test
 
-manylinux-python3.8_task:
+manylinux-python3.9_task:
   container:
     dockerfile: ci/manylinux.docker
     cpu: 1
   env:
-    PATH: "/opt/python/cp38-cp38/bin/:${PATH}"
+    PATH: "/opt/python/cp39-cp39/bin/:${PATH}"
   << : *test
 
 miniconda_task:

.github/workflows/tests.yml

@@ -50,8 +50,8 @@ jobs:
           - macos-13
           - windows-latest
         python:
-          - '3.8'
           - '3.13'
+          - '3.9'
         meson:
           -
         dependencies:
@@ -61,10 +61,6 @@ jobs:
             python: 'pypy-3.9'
           - os: ubuntu-latest
             python: 'pypy-3.11'
-          - os: ubuntu-latest
-            python: '3.8'
-          - os: ubuntu-latest
-            python: '3.9'
           - os: ubuntu-latest
             python: '3.10'
           # Test with older supported Meson version.  Meson up to