update setuptools pin & links

package/pyproject.toml

@@ -12,9 +12,11 @@ requires = [
     # For unreleased versions of Python there is currently no known supported
     # NumPy version. In that case we just let it be a bare NumPy install
     "numpy<2.0; python_version>='3.13'",
-    "setuptools",
+    # Set to minimum version of setuptools that allows pyproject.toml
+    "setuptools >= 40.9.0",
     "wheel",
 ]
+build-backend = "setuptools.build_meta"
 
 [project]
 name = "MDAnalysis"
@@ -96,15 +98,14 @@ doc = [
 ]
 
 [project.urls]
-"Project URL" = "https://www.mdanalysis.org"
-"Download URL" = "https://github.com/MDAnalysis/mdanalysis/releases"
+Homepage = "https://www.mdanalysis.org"
+Download = "https://github.com/MDAnalysis/mdanalysis/releases"
 Documentation = "https://docs.mdanalysis.org/"
 "User Guide" = "https://userguide.mdanalysis.org/"
 "Issue Tracker" = "https://github.com/mdanalysis/mdanalysis/issues"
 "Github Discussions" = "https://github.com/MDAnalysis/mdanalysis/discussions"
 Discord = "https://discord.com/channels/807348386012987462/"
 Blog = "https://www.mdanalysis.org/blog/"
-Twitter = 'https://twitter.com/mdanalysis'
 Source = 'https://github.com/mdanalysis/mdanalysis'
 
 [tool.setuptools]