pyproject.toml: PEP 639 compatibility (#209)

* pyproject.toml: PEP 639 compatibility

Signed-off-by: Adam J. Stewart <ajstewart426@gmail.com>

* setuptools 77.0.3+

Co-authored-by: Dimitri Papadopoulos Orfanos <3234522+DimitriPapadopoulos@users.noreply.github.com>

* MIT-0 AND MIT

Co-authored-by: Dimitri Papadopoulos Orfanos <3234522+DimitriPapadopoulos@users.noreply.github.com>

* Remove vendored license

Signed-off-by: Adam J. Stewart <ajstewart426@gmail.com>

---------

Signed-off-by: Adam J. Stewart <ajstewart426@gmail.com>
Co-authored-by: Dimitri Papadopoulos Orfanos <3234522+DimitriPapadopoulos@users.noreply.github.com>

Author: adamjstewart

pyproject.toml

@@ -1,8 +1,7 @@
 [build-system]
 requires = [
-    # first version that supports Python 3.12; older versions may work
-    # with previous Python versions, but are not tested
-    "setuptools >= 66.1"
+    # Required for PEP 639 support
+    "setuptools >= 77.0.3"
 ]
 build-backend = "setuptools.build_meta"
 
@@ -16,7 +15,8 @@ requires-python = ">=3.9"
 
 description = "Foreign Function Interface for Python calling C code."
 readme = "README.md"
-license = { file = "LICENSE" }
+license = "MIT-0"
+license-files = ["LICENSE"]
 classifiers = [
     "Programming Language :: Python",
     "Programming Language :: Python :: 3",