Update to latest flux (#535)

By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache 2.0 and MIT licenses.

Author: nilehmann

.github/workflows/flux.yml

@@ -8,8 +8,8 @@ on:
     branches: [main]
 
 env:
-  FLUX_VERSION: "23a030c2dc61faf10afb051474bdbbcb12a1b3e3"
-  FIXPOINT_VERSION: "nightly-10-15-2025"
+  FLUX_VERSION: "27e3ef52b52253a1d128aff7b80894bed4da0c95"
+  FIXPOINT_VERSION: "nightly-01-14-2026"
 
 jobs:
   check-flux-on-core: