Officially drop Python 3.8 support (#13386)

Author: srittau

README.md

@@ -21,7 +21,7 @@ the project the stubs are for, but instead report them here to typeshed.**
 Further documentation on stub files, typeshed, and Python's typing system in
 general, can also be found at https://typing.readthedocs.io/en/latest/.
 
-Typeshed supports Python versions 3.8 to 3.13.
+Typeshed supports Python versions 3.9 to 3.13.
 
 ## Using
 

pyproject.toml

@@ -171,4 +171,4 @@ extra-standard-library = [
 known-first-party = ["_utils", "ts_utils"]
 
 [tool.typeshed]
-oldest_supported_python = "3.8"
+oldest_supported_python = "3.9"

stubs/icalendar/METADATA.toml

@@ -1,10 +1,6 @@
 version = "6.1.*"
 upstream_repository = "https://github.com/collective/icalendar"
-requires = [
-    "types-python-dateutil",
-    "types-pytz",
-    "backports.zoneinfo; python_version<'3.9'",
-]
+requires = ["types-python-dateutil", "types-pytz"]
 
 [tool.stubtest]
 stubtest_requirements = ["pytz"]

stubs/pycocotools/METADATA.toml

@@ -1,5 +1,3 @@
 version = "2.0.*"
 upstream_repository = "https://github.com/ppwwyyxx/cocoapi"
-requires = ["numpy>=2.0.0rc1; python_version>='3.9'"]
-# numpy>=2.0.0 requires Python >=3.9
-requires_python = ">=3.9"
+requires = ["numpy>=2.0.0rc1"]

stubs/seaborn/METADATA.toml

@@ -1,14 +1,4 @@
 version = "0.13.2"
 # Requires a version of numpy and matplotlib with a `py.typed` file
-#
-# TODO: Specifying the python-version for matplotlib should not be necessary,
-# because of the requires_python field. However, this needs changes to
-# get_typeshed_stub_version.py (see there).
-requires = [
-    "matplotlib>=3.8; python_version>='3.9'",
-    "numpy>=1.20",
-    "pandas-stubs",
-]
-# matplotlib>=3.8 requires Python >=3.9
-requires_python = ">=3.9"
+requires = ["matplotlib>=3.8", "numpy>=1.20", "pandas-stubs"]
 upstream_repository = "https://github.com/mwaskom/seaborn"