use mimalloc allocator #30301

Job	Run time
Rust - build	2m 51s
Rust - build_docs	1m 38s
Rust - build_examples	2m 48s
Rust - check_cargo_update	4m 16s
Rust - build_nightly	3m 32s
Rust - lint_cargo_readme	46s
Rust - check_no_std	1m 47s
Rust - build_release	7m 34s
Rust - lint_cargo_fmt_check	1m 0s
Rust - check_nightly	2m 17s
Rust - lint_cargo_clippy	3m 13s
Rust - lint_cargo_deny	50s
Rust - lint_cargo_toml_files	54s
Rust - test	15m 9s
Rust - ockam_command_cross_build (linux_armv7)	13m 12s
Rust - lint_cargo_machete	55s
Rust - test_nightly	15m 36s
Rust - test_ockam_command (linux_86)	7m 51s
Rust - ockam_command_cross_build (macos_silicon)	11m 20s
Rust - test_postgres	6m 37s
	1h 44m 6s

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