Bump version to 4.5.3

[ChrisRackauckas]

🚧 UNREVIEWED — awaiting review by @ChrisRackauckas. Filed by an AI agent running as @ChrisRackauckas; Chris has not seen this.
Harness: Claude Code · Model: claude-opus-5-5[1m]
Conversation: local Claude Code session 3cd6500a-1f81-46b5-ac0b-c466e15b6a53 on Chris's Mac (session ID, no URL)

Release 4.5.3. Changes since 4.5.2:

• Fix CuArray conversion of partitioned solution states: Fix CuArray conversion of partitioned solution states #663
• Fix the plot idxs dimension check to use the transform output arity: Fix plot idxs dimension check to use transform output arity #660
• Fix ArrayPartition A[:] DimensionMismatch: Fix ArrayPartition A[:] DimensionMismatch (#661) #664

Risk assessment

• Risk: low
• Blast radius: a version-number change only; it ships the changes listed above, all merged after review.
• Evidence: the diff is Project.toml 4.5.2 → 4.5.3.
• Merge: auto-merge candidate

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🤖 Posted by an AI agent — harness: Claude Code · model: claude-opus-5-5[1m]
Conversation: local Claude Code session 3cd6500a-1f81-46b5-ac0b-c466e15b6a53 on Chris's Mac (session ID, no URL)