Add Python version specifiers to [core] dependencies

Add Python version specifiers to importlib_metadata, importlib_resources and tomli dependencies, to require them only on Python versions on which they are actually used.
pypa · Jul 19, 2024 · 8608d38 · 8608d38
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diff --git a/newsfragments/4492.misc.rst b/newsfragments/4492.misc.rst
@@ -0,0 +1 @@
+Now backports in ``core`` dependencies are installed only on Python versions requiring them.
diff --git a/pyproject.toml b/pyproject.toml
@@ -107,9 +107,9 @@ core = [
 	"ordered-set>=3.1.1",
 	"more_itertools>=8.8",
 	"jaraco.text>=3.7",
-	"importlib_resources>=5.10.2",
-	"importlib_metadata>=6",
-	"tomli>=2.0.1",
+	"importlib_resources>=5.10.2; python_version < '3.9'",
+	"importlib_metadata>=6; python_version < '3.10'",
+	"tomli>=2.0.1; python_version < '3.11'",
 	"wheel>=0.43.0",
 
 	# pkg_resources