build: require cffi 1.17.0

We don't test cffi 1.11.0. With Python moving to isolated build
environments that install their own dependencies, we should be able
to aggressively use newer versions.

Author: indygreg

docs/news.rst

@@ -11,9 +11,9 @@ Changes
 -------
 
 * Bundled zstd library upgraded from 1.5.6 to 1.5.7. (#255)
-* We now use a non-rc version of cffi 1.17 on all Python versions. Python
-  <=3.12 have cffi upgraded from cffi 1.16 -> 1.17.
- * The ``pyproject.toml`` file now defines a ``[project]`` section.
+* We now use and require cffi 1.17.0 or newer. Previously, the constraint
+  was >=1.11.0 on Python <3.13.
+* The ``pyproject.toml`` file now defines a ``[project]`` section.
 * We now use GitHub's native ARM Linux runners to build wheels and run tests.
   Previously, Linux ARM wheels were built inside a QEMU virtualized environment
   and we didn't run tests on this platform.

pyproject.toml

@@ -25,7 +25,6 @@ dependencies = []
 
 [project.optional-dependencies]
 cffi = [
-    'cffi>=1.11 ; python_version < "3.13" and platform_python_implementation != "PyPy"',
     'cffi>=1.17 ; python_version >= "3.13" and platform_python_implementation != "PyPy"',
 ]
 

setup.py

@@ -28,15 +28,14 @@
 # (like memoryview).
 # Need feature in 1.11 for ffi.gc() to declare size of objects so we avoid
 # garbage collection pitfalls.
-MINIMUM_CFFI_VERSION = "1.11"
-
-# Need 1.17+ on 3.13 to avoid deprecated and removed APIs.
-if sys.version_info[0:2] >= (3, 13):
-    MINIMUM_CFFI_VERSION = "1.17"
+# Require 1.17 everywhere so we don't have to think about supporting older
+# versions.
+MINIMUM_CFFI_VERSION = "1.17"
 
 ext_suffix = os.environ.get("SETUPTOOLS_EXT_SUFFIX")
 if ext_suffix:
     import sysconfig
+
     # setuptools._distutils.command.build_ext doesn't use
     # SETUPTOOLS_EXT_SUFFIX like setuptools.command.build_ext does.
     # Work around the issue so that cross-compilation can work