[Py] drop Python 3.8 support

Author: tttapa

pyproject.toml

@@ -1,7 +1,7 @@
 [project]
 name = "alpaqa"
 readme = "python/README.rst"
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 license = { "file" = "LICENSE" }
 authors = [{ "name" = "Pieter P", "email" = "[email protected]" }]
 keywords = ["optimization", "panoc", "alm", "mpc"]
@@ -12,11 +12,11 @@ classifiers = [
     "Topic :: Scientific/Engineering",
     "Topic :: Scientific/Engineering :: Mathematics",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
     "Operating System :: POSIX :: Linux",
     "Operating System :: Microsoft :: Windows",
     "Operating System :: MacOS",

python/alpaqa-debug/pyproject.toml

@@ -1,7 +1,7 @@
 [project]
 name = "alpaqa-debug"
 readme = "README.rst"
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 license = { "file" = "../../LICENSE" }
 authors = [{ "name" = "Pieter P", "email" = "[email protected]" }]
 keywords = []