Remove py < 3.9 deps; Mention dropped python version support in changes

Also removes the "Modernize project definition" entry. CHANGES.rst
should be written for users of the library. The entry had no relevance
for end users.

Author: mfussenegger

CHANGES.rst

@@ -4,8 +4,11 @@ Changes for crate
 
 Unreleased
 ==========
-- Modernize project definition to latest Python best practices. Thanks, @surister.
-- Exceptions: Exceptions from the BLOB API now include their full names.
+
+- Exceptions from the BLOB API now include their full names.
+
+- Dropped support for Python versions earlier than 3.10 as they've reached
+  their end of life.
 
 2025/01/30 2.0.0
 ================

pyproject.toml

@@ -49,15 +49,13 @@ classifiers = [
         "Topic :: System :: Networking",
 ]
 dependencies = [
-    "importlib-metadata; python_version<'3.8'",
     "orjson",
     "urllib3",
     "verlib2>=0.3.1",
 ]
 
 [dependency-groups]
 dev = [
-    "backports.zoneinfo<1; python_version<'3.9'",
     "certifi",
     "coverage",
     "mypy<1.20",