feat: add support for Python 3.13 (#383)

This change adds support for Python 3.13. It does the following:
- The latest Python version that presubmit tests use is now Python 3.13, instead of Python 3.12.
- Remove `psycopg2-binary` package from `requirements-test.txt`, because Python 3.13 requires psycopg version 2.9.10. But 2.9.10 is not yet fully supported on Windows and Mac. As a result, we cannot run [test_psycopg2_direct_connection.py](https://github.com/GoogleCloudPlatform/alloydb-python-connector/pull/383/files#diff-58b933e0c009174fe693b297def131f462f39e29de5b887468865f45efb5dea8) as part of our presubmit tests. So we move it to the `docs/samples/` folder for now. Re-adding `psycopg2-binary` package and `test_psycopg2_direct_connection.py` to our presubmit tests is being tracked in #388.

.github/workflows/tests.yaml

@@ -38,7 +38,7 @@ jobs:
     strategy:
       matrix:
         os: [macos-latest, windows-latest, ubuntu-latest]
-        python-version: ["3.9", "3.12"]
+        python-version: ["3.9", "3.13"]
       fail-fast: false
     steps:
       - name: Checkout code
@@ -99,7 +99,7 @@ jobs:
       (github.event.pull_request.head.repo.full_name == github.repository && github.actor != 'dependabot[bot]')
     strategy:
       matrix:
-        python-version: ["3.9", "3.12"]
+        python-version: ["3.9", "3.13"]
       fail-fast: false
     permissions:
       contents: read

noxfile.py

@@ -22,8 +22,8 @@
 ISORT_VERSION = "isort==5.13.2"
 LINT_PATHS = ["google", "tests", "noxfile.py", "setup.py"]
 
-SYSTEM_TEST_PYTHON_VERSIONS = ["3.9", "3.10", "3.11", "3.12"]
-UNIT_TEST_PYTHON_VERSIONS = ["3.9", "3.10", "3.11", "3.12"]
+SYSTEM_TEST_PYTHON_VERSIONS = ["3.9", "3.10", "3.11", "3.12", "3.13"]
+UNIT_TEST_PYTHON_VERSIONS = ["3.9", "3.10", "3.11", "3.12", "3.13"]
 
 
 @nox.session

requirements-test.txt

@@ -1,7 +1,6 @@
 asyncpg==0.30.0
 mock==5.1.0
 pg8000==1.31.2
-psycopg2-binary==2.9.9
 pytest==8.3.3
 pytest-asyncio==0.24.0
 pytest-cov==5.0.0

setup.py

@@ -70,6 +70,7 @@
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: 3.13",
     ],
     platforms="Posix; MacOS X; Windows",
     packages=packages,