Set rust-version to 1.77 to fix build error

[jtbandes]

I got the following error when installing 4.0.0 with yarn:

# This file contains the result of Yarn building a package (node-crc@npm:4.0.0)
# Script name: install

...

error: the `cargo::` syntax for build script output instructions was added in Rust 1.77.0, but the minimum supported Rust version of `node-crc v4.0.0 (.../node_modules/node-crc)` is 1.65.
Switch to the old `cargo:rerun-if-env-changed=NAPI_DEBUG_GENERATED_CODE` syntax (note the single colon).
See https://doc.rust-lang.org/cargo/reference/build-scripts.html#outputs-of-the-build-script for more information about build script outputs.
warning: build failed, waiting for other jobs to finish...
[31m[1mInternal Error[22m[39m: Command failed: cargo build --release
    at genericNodeError (node:internal/errors:983:15)
    at wrappedFn (node:internal/errors:537:14)
    at checkExecSyncError (node:child_process:882:11)
    at Object.execSync (node:child_process:954:15)
    at BuildCommand.<anonymous> (.../node_modules/@napi-rs/cli/scripts/index.js:11529:30)
    at Generator.next (<anonymous>)
    at .../node_modules/@napi-rs/cli/scripts/index.js:3526:69
    at new Promise (<anonymous>)
    at __awaiter$1 (.../node_modules/@napi-rs/cli/scripts/index.js:3522:10)
    at BuildCommand.execute (.../node_modules/@napi-rs/cli/scripts/index.js:11299:16)

This seems to be fixed by changing the rust-version to 1.77 as mentioned in the error message.