Update Rust crate iddqd to 0.4.2

[nextest-bot]

This PR contains the following updates:

Package	Type	Update	Change
iddqd	workspace.dependencies	patch	0.4.1 → 0.4.2

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Release Notes

oxidecomputer/iddqd (iddqd)

v0.4.2

Compare Source

Fixed

• The retain callbacks no longer permit the RefMut to be stashed outside them. This is technically a breaking change, but is being treated as a soundness bugfix.
• A number of soundness and resilience fixes for pathological implementations. These were found through a combination of human-driven analysis, example-based tests with Miri, chaos testing using fault injection with proptest, and adversarial code review from Claude Opus 4.7 and GPT-5.5. In particular, iddqd now more consistently preserves internal map state across panics in user code by using patterns like prepare-then-commit, index-based cleanup, cached hashes, and careful ordering of user-code execution relative to internal mutations.

Changed

• MSRV updated to Rust 1.85.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.53%. Comparing base (6b14ede) to head (5a02859).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3365   +/-   ##
=======================================
  Coverage   85.53%   85.53%           
=======================================
  Files         160      160           
  Lines       47954    47954           
=======================================
+ Hits        41016    41017    +1     
+ Misses       6938     6937    -1     

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