CI: test with julia 1.12 and 1.13-nightly (#2204)

Author: lgoettgens

.github/workflows/CI.yml

@@ -28,6 +28,8 @@ jobs:
         julia-version:
           - '1.10'
           - '1.11'
+          - '1.12'
+          - '1.13-nightly'
           - 'nightly'
         os:
           - ubuntu-latest