Update CI to test on Julia 1, lts, and pre versions

Uncomment 'pre' version testing to align with SciML ecosystem standards
and ensure compatibility across all supported Julia versions.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: claude

.github/workflows/CI_BoundaryValueDiffEq.yml

@@ -39,7 +39,7 @@ jobs:
         version:
           - "1"
           - "lts"
-          #- "pre"
+          - "pre"
         os:
           - ubuntu-latest
     steps: