ci: update rust to 1.81 #1414

Job	Run time
tests (vmm/sandbox, --all-features)	3m 44s
checks (vmm/sandbox, --all-features)	1m 30s
tests (vmm/task, --all-features)	3m 17s
checks (vmm/task, --all-features)	1m 31s
tests (shim, --all-features)	2m 29s
checks (shim, --all-features)	1m 18s
tests (quark, --all-features)	2m 29s
checks (quark, --all-features)	1m 15s
tests (runc, --all-features)	2m 58s
checks (runc, --all-features)	1m 30s
tests (wasm, --features=wasmedge, 0.13.5)	3m 21s
checks (wasm, --features=wasmedge, 0.13.5)	1m 29s
tests (wasm, --features=wasmtime)	3m 51s
checks (wasm, --features="wasmedge, wasmedge_wasi_nn", 0.13.5)	1m 30s
checks (wasm, --features=wasmtime)	1m 29s
	33m 41s

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