fix CI for new ubuntu rolling (#1426)

.github/workflows/ci.yml

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9691f63..b4c9ac3 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -71,7 +71,7 @@
       matrix:
         TEST:
           # cryptographyMain used since there's no wheel
-          - {CONTAINER: "ubuntu-rolling", TOXENV: "py312-cryptographyMain"}
+          - {CONTAINER: "ubuntu-rolling", TOXENV: "py313-cryptographyMain"}
     name: "${{ matrix.TEST.TOXENV }} on ${{ matrix.TEST.CONTAINER }}"
     steps:
       - uses: actions/checkout@v4