ci: run tests on Py 3.12 and install test on Py 3.13 (#1315)

Python 3.13 has reached rc1, this PR adds it to the test matrix.

Note: not using free-threaded builds at this point due to
actions/setup-python#771 (not like we'd expect
any difference, frankly)

.github/workflows/framework-tests.yaml

@@ -43,7 +43,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest]
-        python-version: ["3.8", "3.10"]
+        python-version: ["3.8", "3.10", "3.12"]
         exclude:
         - {python-version: "3.8", os: "macos-latest"}  # macos-14 is arm64, and there's no Python 3.8 build for arm64
 
@@ -66,7 +66,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python-version: ["3.8", "3.10"]
+        python-version: ["3.8", "3.10", "3.12"]
 
     steps:
       - uses: actions/checkout@v4
@@ -105,7 +105,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest]
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
         exclude:
         - {python-version: "3.8", os: "macos-latest"}  # macos-14 is arm64, and there's no Python 3.8 build for arm64
         - {python-version: "3.9", os: "macos-latest"}  # macos-14 is arm64, and there's no Python 3.9 build for arm64
@@ -116,6 +116,7 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
+          allow-prereleases: true
 
       - name: Install build dependencies
         run: pip install wheel build