Bump serde_with to version 3.15.1

[brandonweeks]

Eliminates an extra copy of darling from the dependency tree.

[github-actions]

Bencher Report

Branch	serde_with
Testbed	ubuntu-latest

Click to view all benchmark results

Benchmark	Latency	microseconds (µs)
diagnostics-benches/inputs/goto-perf.ncl	📈 view plot 🚷 view threshold	11,145.00 µs
diagnostics-benches/inputs/large-record-tree.ncl	📈 view plot 🚷 view threshold	197,380.00 µs
diagnostics-benches/inputs/redis-replication-controller.ncl	📈 view plot 🚷 view threshold	315.87 µs
diagnostics-benches/inputs/small-record-tree.ncl	📈 view plot 🚷 view threshold	444.77 µs
fibonacci 10	📈 view plot 🚷 view threshold	253.09 µs
foldl arrays 50	📈 view plot 🚷 view threshold	450.40 µs
foldl arrays 500	📈 view plot 🚷 view threshold	3,742.10 µs
foldr strings 50	📈 view plot 🚷 view threshold	4,400.70 µs
foldr strings 500	📈 view plot 🚷 view threshold	43,672.00 µs
generate normal 250	📈 view plot 🚷 view threshold	46,591.00 µs
generate normal 50	📈 view plot 🚷 view threshold	1,645.50 µs
generate normal unchecked 1000	📈 view plot 🚷 view threshold	1,977.40 µs
generate normal unchecked 200	📈 view plot 🚷 view threshold	419.00 µs
init-diagnostics-benches/inputs/goto-perf.ncl	📈 view plot 🚷 view threshold	55,007.00 µs
init-diagnostics-benches/inputs/large-record-tree.ncl	📈 view plot 🚷 view threshold	222,090.00 µs
init-diagnostics-benches/inputs/redis-replication-controller.ncl	📈 view plot 🚷 view threshold	49,119.00 µs
init-diagnostics-benches/inputs/small-record-tree.ncl	📈 view plot 🚷 view threshold	49,498.00 µs
pidigits 100	📈 view plot 🚷 view threshold	2,115.80 µs
pipe normal 20	📈 view plot 🚷 view threshold	663.76 µs
pipe normal 200	📈 view plot 🚷 view threshold	5,642.10 µs
product 30	📈 view plot 🚷 view threshold	246.66 µs
requests-benches/inputs/goto-perf.ncl-000	📈 view plot 🚷 view threshold	3,232.90 µs
requests-benches/inputs/large-record-tree.ncl-000	📈 view plot 🚷 view threshold	616,040.00 µs
requests-benches/inputs/large-record-tree.ncl-001	📈 view plot 🚷 view threshold	92.47 µs
scalar 10	📈 view plot 🚷 view threshold	551.27 µs
sum 30	📈 view plot 🚷 view threshold	247.54 µs

🐰 View full continuous benchmarking report in Bencher

[yannham]

Is it on purpose that no change to Cargo.toml was committed here? Is it a pure lockfile update?