CI: update to Python 3.12; also test with 3.13

.github/workflows/build.yml

@@ -45,7 +45,7 @@ jobs:
 
     - uses: actions/setup-python@v5
       with:
-        python-version: '3.11'
+        python-version: '3.12'
         cache: 'pip'
         cache-dependency-path: 'requirements.txt'
 
@@ -125,7 +125,7 @@ jobs:
 
     - uses: actions/setup-python@v5
       with:
-        python-version: '3.11'
+        python-version: '3.12'
         cache: 'pip'
         cache-dependency-path: 'requirements.txt'
         # Note that ARM64 prior to Win11 requires x86, but this will install x64

.github/workflows/maint.yml

@@ -42,7 +42,7 @@ jobs:
 
     - uses: actions/setup-python@v5
       with:
-        python-version: '3.11'
+        python-version: '3.12'
         cache: 'pip'
         cache-dependency-path: 'requirements.txt'
 

.github/workflows/test.yml

@@ -10,7 +10,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-22.04, windows-2022]
-        python-version: ['3.10', '3.11', '3.12']
+        python-version: ['3.10', '3.11', '3.12', '3.13']
 
     steps:
     - uses: actions/checkout@v4