chore(deps): bump serde from 1.0.203 to 1.0.204

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Bumps serde from 1.0.203 to 1.0.204.

Release notes

Sourced from serde's releases.

v1.0.204

• Apply #[diagnostic::on_unimplemented] attribute on Rust 1.78+ to suggest adding serde derive or enabling a "serde" feature flag in dependencies (#2767, thanks @​weiznich)

Commits

• 18dcae0 Release 1.0.204
• 58c307f Alphabetize list of rustc-check-cfg
• 8cc4809 Merge pull request #2769 from dtolnay/onunimpl
• 1179158 Update ui test with diagnostic::on_unimplemented from PR 2767
• 91aa40e Add ui test of unsatisfied serde trait bound
• 595019e Cut test_suite from workspace members in old toolchain CI jobs
• b0d7917 Pull in trybuild 'following types implement trait' fix
• 8e6637a Merge pull request #2767 from weiznich/feature/diagnostic_on_unimplemented
• 694fe05 Use the #[diagnostic::on_unimplemented] attribute when possible
• f3dfd2a Suppress dead code warning in test of unit struct remote derive
• Additional commits viewable in compare view

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[github-actions]

Valgrind Results:

==3897== Cachegrind, a cache and branch-prediction profiler
==3897== Copyright (C) 2002-2017, and GNU GPL'd, by Nicholas Nethercote et al.
==3897== Using Valgrind-3.18.1 and LibVEX; rerun with -h for copyright info
==3897== Command: target/release/snailtracer
==3897== 
--3897-- warning: L3 cache found, using its data for the LL simulation.
Running snailtracer example!
elapsed: 1.858456928s
==3897== 
==3897== I   refs:      427,038,554
==3897== I1  misses:          3,084
==3897== LLi misses:          2,807
==3897== I1  miss rate:        0.00%
==3897== LLi miss rate:        0.00%
==3897== 
==3897== D   refs:      204,076,608  (132,268,510 rd   + 71,808,098 wr)
==3897== D1  misses:        341,088  (    201,070 rd   +    140,018 wr)
==3897== LLd misses:        137,816  (      4,494 rd   +    133,322 wr)
==3897== D1  miss rate:         0.2% (        0.2%     +        0.2%  )
==3897== LLd miss rate:         0.1% (        0.0%     +        0.2%  )
==3897== 
==3897== LL refs:           344,172  (    204,154 rd   +    140,018 wr)
==3897== LL misses:         140,623  (      7,301 rd   +    133,322 wr)
==3897== LL miss rate:          0.0% (        0.0%     +        0.2%  )