Bump cffi to 2.0

Allows for free-threaded CPython support

Author: HexDecimal

pyproject.toml

@@ -6,7 +6,7 @@ requires = [
     "setuptools_scm[toml]>=6.2",
     "packaging>=24.2",
     "wheel>=0.37.1",
-    "cffi>=1.15",
+    "cffi>=2.0",
     "pycparser>=2.14",
     "pcpp==1.30",
     "requests>=2.28.1",
@@ -28,7 +28,7 @@ license-files = [
     "libtcod/LIBTCOD-CREDITS.txt",
 ]
 dependencies = [
-    "cffi>=1.15",
+    "cffi>=2.0",
     'numpy>=1.21.4; implementation_name != "pypy"',
     "typing_extensions>=4.12.2",
 ]

requirements.txt

@@ -1,5 +1,5 @@
 attrs>=23.1.0
-cffi>=1.15
+cffi>=2.0
 numpy>=1.21.4
 pycparser>=2.14
 requests>=2.28.1