Update mrsv to 1.65 where backtrace is stable #865

Job	Run time
Clippy	13s
Test Rust stable on ubuntu	10s
Doc tests	27s
Test Rust stable on macOS	12s
Minimal crates versions (stable, ubuntu)	25s
rustfmt	11s
Test Rust stable on windows	8s
Minimal crates versions (stable, macOS)	30s
Test features	10s
Test Rust nightly on ubuntu	11s
Minimal crates versions (stable, windows)	54s
Test Rust nightly on macOS	12s
Test Rust nightly on windows	8s
Test Rust 1.36.0 on ubuntu	10s
Test Rust 1.36.0 on macOS	7s
Test Rust 1.36.0 on windows	10s
	4m 18s

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