Update Sundials requirement from 4.24, 5.1 to 4.24, 5.1, 6.2

[dependabot]

Updates the requirements on Sundials to permit the latest version.

Release notes

Sourced from Sundials's releases.

v6.2.2

Sundials v6.2.2

Diff since v6.2.1

Merged pull requests:

• Re-enable downgrade CI (#533) (@​ChrisRackauckas-Claude)
• Downgrade CI: switch to allow_reresolve=false (genuine test-at-floor) (#534) (@​ChrisRackauckas-Claude)
• Centralize CI on SciML reusable workflows (#535) (@​ChrisRackauckas-Claude)
• ci: add standard centralized workflows (auto-format, dependabot-automerge, docs-preview-cleanup) (#536) (@​ChrisRackauckas-Claude)
• Drop now-invalid allow-reresolve input from downgrade workflow(s) (#537) (@​ChrisRackauckas-Claude)
• Canonical CI cleanup: TagBot thin-caller + downgrade-caller cleanup (#538) (@​ChrisRackauckas-Claude)
• Bump actions/checkout from 6 to 7 (#539) (@​dependabot[bot])
• Release v6.2.2 (#540) (@​ChrisRackauckas)

Changelog

Sourced from Sundials's changelog.

Sundials.jl NEWS

v5.0.0

Breaking Changes

Upgrade to Sundials v7

This release updates the underlying Sundials C library from v5 to v7, which introduces significant API changes. This is a breaking change for users directly using the low-level Sundials API.

Key Changes:

1. SUNContext requirement: All Sundials objects now require a SUNContext object for creation. This context manages the Sundials environment and must be created before any solver objects.

2. Memory management: The new context-based approach improves thread safety and resource management.

Migration Guide for Low-Level API Users:

If you're using the low-level Sundials API directly (not through the DiffEq interface):

# Old code (v4.x) - No context needed
mem_ptr = CVodeCreate(CV_BDF)
mem = Handle(mem_ptr)

# New code (v5.0) - Context required
ctx_ptr = Ref{SUNContext}(C_NULL)
SUNContext_Create(C_NULL, Base.unsafe_convert(Ptr{SUNContext}, ctx_ptr))
ctx = ctx_ptr[]
mem_ptr = CVodeCreate(CV_BDF, ctx)  # Context passed as argument
mem = Handle(mem_ptr)
# ... use solver ...
SUNContext_Free(ctx)  # Clean up context when done

Automatic handling in high-level interface:

If you're using the standard DiffEq interface (solve(prob, CVODE_BDF())), no changes are needed. The context is automatically managed internally:

# This continues to work without changes
sol = solve(prob, CVODE_BDF())

Functions affected by context requirement:

• All solver creation functions (CVodeCreate, ARKStepCreate, IDACreate, KINCreate)
• All vector creation functions (N_VNew_Serial, etc.)
• All matrix creation functions (SUNDenseMatrix, SUNBandMatrix, etc.)

... (truncated)

Commits

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