Update Rust toolchain to 1.88 and MSRV to 1.86 (#19011) #35

Job	Run time
cargo fmt	18s
Determine changes	11s
cargo build (release)	9m 8s
pre-commit	1s
mkdocs	5m 14s
python package	2m 51s
cargo test (linux, release)	1d 0h 0m 1s
cargo clippy	4m 12s
cargo test (linux)	1d 0h 0m 1s
cargo test (windows)	1s
cargo shear	21s
formatter instabilities and black similarity	4m 27s
cargo test (wasm)	2m 56s
cargo build (msrv)	1d 0h 0m 1s
cargo fuzz build	4m 39s
test scripts	2m 20s
benchmarks-instrumented	0s
benchmarks-walltime	-1s
check playground	-1s
fuzz parser	0s
ecosystem	0s
Fuzz for new ty panics	0s
test ruff-lsp	0s
	3d 0h 36m 40s

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