Added official Python 3.13 support (agronholm#765)

docs/versionhistory.rst

@@ -10,6 +10,7 @@ This library adheres to `Semantic Versioning 2.0 <http://semver.org/>`_.
   (`#737 <https://github.com/agronholm/anyio/issues/737>`_)
 - Changed the ``ResourceWarning`` from an unclosed memory object stream to include its
   address for easier identification
+- Bumped minimum version of Trio to v0.26.1
 - Fixed ``to_process.run_sync()`` failing to initialize if ``__main__.__file__`` pointed
   to a file in a nonexistent directory
   (`#696 <https://github.com/agronholm/anyio/issues/696>`_)

pyproject.toml

@@ -24,6 +24,7 @@ classifiers = [
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
 ]
 requires-python = ">= 3.8"
 dependencies = [
@@ -41,7 +42,7 @@ Changelog = "https://anyio.readthedocs.io/en/stable/versionhistory.html"
 "Issue tracker" = "https://github.com/agronholm/anyio/issues"
 
 [project.optional-dependencies]
-trio = ["trio >= 0.23"]
+trio = ["trio >= 0.26.1"]
 test = [
     "anyio[trio]",
     "coverage[toml] >= 7",
@@ -51,7 +52,10 @@ test = [
     "pytest >= 7.0",
     "pytest-mock >= 3.6.1",
     "trustme",
-    "uvloop >= 0.17; platform_python_implementation == 'CPython' and platform_system != 'Windows'",
+    """\
+    uvloop >= 0.17; platform_python_implementation == 'CPython' \
+    and platform_system != 'Windows' and python_version < '3.13'\
+    """
 ]
 doc = [
     "packaging",