Remove special exception for broken 3.13.4

Don't think any of the runners are likely to have it anymore.

Author: jonathanhogg

.github/workflows/ci-test.yml

@@ -20,7 +20,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ['3.10', '3.11', '3.12', '>=3.13 <3.13.4 || >3.13.4 <3.14']
+        python-version: ['3.10', '3.11', '3.12', '3.13']
         os: [ubuntu-latest, ubuntu-24.04-arm, windows-latest, macos-15-intel, macos-15]
         include:
         - os: macos-15-intel