Disable testing on Julia 1.12 for the time being

Some of the signatures in LinearAlgebra has changed which causes test
failures.

Author: andreasnoack

.github/workflows/ci.yml

@@ -40,7 +40,7 @@ jobs:
           - 'min'
           - 'lts'
           - '1'
-          - 'pre'
+          # - 'pre'
         os:
           - ubuntu-latest
 #           - macos-latest