build: drop support for Python v3.7 and v3.8 (#74)

- allows for adoption of PEP639 (about license info in package metadata).
- deleted dummy setup.py since it was only there for archaic versions of Python (and corresponding pip versions).

Note, Python v3.9 is still supported, but it just reached End-of-Life.

Author: 2bndy5

pyproject.toml

@@ -4,14 +4,14 @@
 
 [build-system]
 requires = [
-    "setuptools>=61",
+    "setuptools>=77",
     "wheel",
     "setuptools-scm",
 ]
 
 [project]
 name = "circuitpython-nrf24l01"
-requires-python = ">=3.7"
+requires-python = ">=3.9"
 description = "CircuitPython driver library for the nRF24L01 transceiver"
 readme = "README.rst"
 authors = [
@@ -27,18 +27,13 @@ keywords = [
     "radio",
     "transceiver",
 ]
-license = {text = "MIT"}
+license = "MIT"
 classifiers = [
     "Development Status :: 5 - Production/Stable",
     "Intended Audience :: Developers",
     "Topic :: Software Development :: Libraries",
     "Topic :: System :: Hardware",
-    "License :: OSI Approved :: MIT License",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.7",
-    "Programming Language :: Python :: 3.8",
-    "Programming Language :: Python :: 3.9",
-    "Programming Language :: Python :: 3.10",
 ]
 dynamic = ["version", "dependencies"]