Merge pull request #302 from messense/python3.12

CI: Add Python 3.12-dev jobs

Author: messense

.github/workflows/ci.yml

@@ -62,7 +62,7 @@ jobs:
       # If one platform fails, allow the rest to keep testing if `CI-no-fail-fast` label is present
       fail-fast: ${{ !contains(github.event.pull_request.labels.*.name, 'CI-no-fail-fast') }}
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", pypy-3.7, pypy-3.8, pypy-3.9]
+        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12-dev", pypy-3.7, pypy-3.8, pypy-3.9]
         platform: [
           { os: "macos-latest",   python-architecture: "x64", rust-target: "x86_64-apple-darwin" },
           { os: "ubuntu-latest", python-architecture: "x64", rust-target: "x86_64-unknown-linux-gnu" },