Update Python version requirements to 3.12 and above (#233)

* Update Python version requirements to 3.11 and above, and add support for 3.14

* Require >= 3.12

* update uv lock

* Use Py_REFCNT over ob_refcnt for reference count checks

Fixes

```
FAILED: [code=1] src/cysignals/signals.cpython-314t-x86_64-linux-gnu.so.p/meson-generated_src_cysignals_signals.pyx.c.o
cc -Isrc/cysignals/signals.cpython-314t-x86_64-linux-gnu.so.p -Isrc/cysignals -I../src/cysignals -Isrc -I../src -I/opt/_internal/cpython-3.14.0rc2-nogil/include/python3.14t -fvisibility=hidden -fdiagnostics-color=always -DNDEBUG -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wextra -O3 -DCYTHON_CLINE_IN_TRACEBACK=0 -U_FORTIFY_SOURCE -fPIC -pthread -MD -MQ src/cysignals/signals.cpython-314t-x86_64-linux-gnu.so.p/meson-generated_src_cysignals_signals.pyx.c.o -MF src/cysignals/signals.cpython-314t-x86_64-linux-gnu.so.p/meson-generated_src_cysignals_signals.pyx.c.o.d -o src/cysignals/signals.cpython-314t-x86_64-linux-gnu.so.p/meson-generated_src_cysignals_signals.pyx.c.o -c src/cysignals/signals.cpython-314t-x86_64-linux-gnu.so.p/src/cysignals/signals.pyx.c
src/cysignals/signals.cpython-314t-x86_64-linux-gnu.so.p/src/cysignals/signals.pyx.c: In function ‘__pyx_f_9cysignals_7signals_verify_exc_value’:
src/cysignals/signals.cpython-314t-x86_64-linux-gnu.so.p/src/cysignals/signals.pyx.c:4699:32: error: ‘PyObject’ {aka ‘struct _object’} has no member named ‘ob_refcnt’
4699 | __pyx_t_1 = (cysigs.exc_value->ob_refcnt == 1);
| ^~
src/cysignals/signals.cpython-314t-x86_64-linux-gnu.so.p/src/cysignals/signals.pyx.c:4996:33: error: ‘PyObject’ {aka ‘struct _object’} has no member named ‘ob_refcnt’
4996 | __pyx_t_10 = (cysigs.exc_value->ob_refcnt == 1);
| ^~
```

* Remove 3.11 from CI

Author: tobiasdiez

.github/workflows/ci.yml

@@ -22,7 +22,7 @@ jobs:
       fail-fast: false
       matrix:
         os: ['macos-14', 'macos-latest', 'ubuntu-latest', 'windows-latest']
-        python-version: ['3.11', '3.12', '3.13', '3.14']
+        python-version: ['3.12', '3.13', '3.14']
     steps:
     - name: Set up the repository
       uses: actions/checkout@v4

README.rst

@@ -22,7 +22,7 @@ signals and errors) in Cython code.
 Requirements
 ------------
 
-- Python >= 3.11
+- Python >= 3.12
 - Cython >= 3.1
 - Sphinx >= 1.6 (for building the documentation)
 

pyproject.toml

@@ -20,8 +20,7 @@ classifiers = [
     "Programming Language :: C",
     "Programming Language :: Cython",
     "Programming Language :: Python",
-    "Programming Language :: Python :: 3 :: Only",
-    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3",
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
     "Programming Language :: Python :: 3.14",
@@ -30,7 +29,7 @@ classifiers = [
     "Topic :: Software Development :: Debuggers",
 ]
 urls = { Homepage = "https://github.com/sagemath/cysignals" }
-requires-python = ">=3.11,<3.15"
+requires-python = ">=3.12"
 
 [project.entry-points.pkg_config]
 cysignals = 'cysignals'

readthedocs.yml

@@ -2,6 +2,6 @@ version: 2
 conda:
     file: readthedocs-conda.yml
 python:
-    version: "3.11"
+    version: "3.12"
     pip_install: true