upgrade rust version to exactly 1.77.0 in Cargo.toml and rust-toolcha… #127

Job	Run time
Latest build on ubuntu-latest	59s
Bitrot check	1m 1s
Check ZFuture build on Linux	1m 27s
Latest build on windows-latest	1m 3s
Build target wasm32-wasi	56s
Check ZFuture build on macOS	1m 29s
Latest build on macOS-latest	59s
Check ZFuture build on Windows	3m 46s
Clippy (MSRV)	35s
Clippy (beta)	12s
Code coverage	2m 56s
Intra-doc links	1m 44s
Rustfmt	13s
protobuf consistency	51s
Test on Linux	1s
UUID validity	3s
Test Orchard on Linux	1s
Test NU6 on Linux	1s
Test on macOS	2m 12s
Test Orchard on macOS	2m 29s
Test on Windows	1s
Test Orchard on Windows	1s
Test NU6 on Windows	1s
	23m 1s

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