chore: change build backend to setuptools to make it work for py <= 3.8

Author: runemalm

pyproject.toml

@@ -6,9 +6,6 @@ authors = [{ name = "David Runemalm", email = "david.runemalm@gmail.com" }]
 license = { text = "MIT" }
 readme = "README.md"
 requires-python = ">=3.7"
-repository = "https://github.com/runemalm/py-dependency-injection"
-homepage = "https://py-dependency-injection.readthedocs.io/en/latest/"
-documentation = "https://py-dependency-injection.readthedocs.io/en/latest/"
 keywords = ["dependency injection", "di", "ioc", "inversion of control", "python"]
 classifiers = [
     "Development Status :: 4 - Beta",
@@ -24,11 +21,15 @@ classifiers = [
     "Programming Language :: Python :: 3.13",
     "Topic :: Software Development :: Libraries :: Python Modules"
 ]
-
 dependencies = [
 
 ]
 
+[project.urls]
+Repository = "https://github.com/runemalm/py-dependency-injection"
+Homepage = "https://py-dependency-injection.readthedocs.io/en/latest/"
+Documentation = "https://py-dependency-injection.readthedocs.io/en/latest/"
+
 [tool.poetry.group.dev]
 optional = true
 
@@ -41,10 +42,10 @@ pytest = "*"
 setuptools = "*"
 wheel = "*"
 
-[tool.poetry.packages]
-include = "dependency_injection"
-from = "src"
+[tool.setuptools]
+packages = ["dependency_injection"]
+package-dir = {"" = "src"}
 
 [build-system]
-requires = ["poetry-core>=2.0.0,<3.0.0"]
-build-backend = "poetry.core.masonry.api"
+requires = ["setuptools", "wheel"]
+build-backend = "setuptools.build_meta"