Drop support for Python 3.10 (#13000)

pyproject.toml

@@ -14,7 +14,7 @@ urls.Download = "https://pypi.org/project/Sphinx/"
 urls.Homepage = "https://www.sphinx-doc.org/"
 urls."Issue tracker" = "https://github.com/sphinx-doc/sphinx/issues"
 license.text = "BSD-2-Clause"
-requires-python = ">=3.10"
+requires-python = ">=3.11"
 
 # Classifiers list: https://pypi.org/classifiers/
 classifiers = [
@@ -31,7 +31,6 @@ classifiers = [
     "Programming Language :: Python",
     "Programming Language :: Python :: 3",
     "Programming Language :: Python :: 3 :: Only",
-    "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
@@ -71,7 +70,6 @@ dependencies = [
     "imagesize>=1.3",
     "requests>=2.30.0",
     "packaging>=23.0",
-    "tomli>=2; python_version < '3.11'",
     "colorama>=0.4.6; sys_platform == 'win32'",
 ]
 dynamic = ["version"]
@@ -92,7 +90,6 @@ lint = [
     "types-Pygments==2.18.0.20240506",
     "types-requests==2.32.0.20240914",  # align with requests
     "types-urllib3==1.26.25.14",
-    "tomli>=2",  # for mypy (Python<=3.10)
     "pyright==1.1.384",
     "pytest>=6.0",
 ]
@@ -204,7 +201,7 @@ exclude = [
     # tests/test_writers
     "^utils/convert_attestations\\.py$",
 ]
-python_version = "3.10"
+python_version = "3.11"
 strict = true
 show_column_numbers = true
 show_error_context = true