Upgrade Trio to 0.25.0 to drop a workaround (#3367)

dev-requirements.txt

@@ -10,10 +10,7 @@ cryptography==42.0.4
 backports.zoneinfo==0.2.1;python_version<"3.9"
 towncrier==23.6.0
 pytest-memray==1.5.0;python_version<"3.13" and sys_platform!="win32" and implementation_name=="cpython"
-trio==0.23.1;python_version<"3.13"
-# We need a release of Trio newer than 0.24.0 to support CPython 3.13.
-# https://github.com/python-trio/trio/issues/2903
-trio @ git+https://github.com/python-trio/trio@e4c8eb2d7ef59eeea1441656e392fe1b0870a374; python_version == "3.13"
+trio==0.25.0
 Quart==0.19.4
 quart-trio==0.11.1
 # https://github.com/pgjones/hypercorn/issues/62