Bump the repo-level rust toolchain to 1.87.0 #1010

Job	Run time
version-sync	3s
cargo-lock	6s
cargo-fmt	22s
cargo-machete	3s
cargo-doc (ubuntu)	25s
cargo-miri (--locked)	1m 50s
cargo-doc (windows)	1m 7s
compilation-benchmarks	2m 6s
cargo-doc (macos)	32s
prettier	11s
cargo-miri	1m 48s
runtime-benchmarks (args_3)	54s
taplo-fmt	3s
test-stable (ubuntu, --locked)	23s
runtime-benchmarks (args_5)	52s
test-msrv (ubuntu, 1.59.0)	1m 2s
test-stable (ubuntu)	1m 20s
test-stable (windows, --locked)	46s
test-unstable (beta, --locked)	26s
test-msrv (ubuntu, 1.61.0)	1m 9s
runtime-benchmarks (args_10_alloc)	52s
test-stable (windows)	44s
test-msrv (windows, 1.59.0)	1m 39s
test-unstable (beta)	30s
runtime-benchmarks (args_10_structs)	1m 33s
test-unstable (nightly, --locked)	28s
runtime-benchmarks (args_10)	56s
test-msrv (windows, 1.61.0)	1m 35s
test-unstable (nightly)	27s
runtime-benchmarks (args_20)	49s
test-stable (macos, --locked)	1m 48s
test-stable (macos)	1m 33s
test-msrv (macos, 1.59.0)	1m 2s
typos	5s
website-build	23s
test-msrv (macos, 1.61.0)	1m 14s
	31m 6s

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