Revert "add 3.13 test runner"

This reverts commit c81b6b6.

Author: haakonvt

.github/workflows/build.yml

@@ -46,7 +46,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest]
-        python-version: ["3.10", "3.11", "3.12", "3.13"]
+        python-version: ["3.10", "3.11", "3.12"] # TODO: 3.9, 3.10 (requires a lot of work for FakeCogResGen for tests)
     steps:
       - uses: actions/checkout@v4
       - uses: ./.github/actions/setup