Cargo.toml msrv appears to be incorrect

[eric-seppanen]

clippy reports msrv problems:

cargo-crev$ cargo clippy --all-features --all-targets -- -Aclippy::all -Wclippy::incompatible_msrv
    Checking crev-common v0.26.3 (.../cargo-crev/crev-common)
    Checking crev-data v0.26.3 (.../cargo-crev/crev-data)
    Checking crev-wot v0.26.3 (.../cargo-crev/crev-wot)
    Checking crev-lib v0.26.3 (.../cargo-crev/crev-lib)
warning: current MSRV (Minimum Supported Rust Version) is `1.77.0` but this item is stable since `1.79.0`
   --> crev-lib/src/util/mod.rs:226:21
    |
226 |     for ch in input.utf8_chunks() {
    |                     ^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#incompatible_msrv
    = note: requested on the command line with `-W clippy::incompatible-msrv`

warning: current MSRV (Minimum Supported Rust Version) is `1.77.0` but this item is stable since `1.79.0`
   --> crev-lib/src/util/mod.rs:227:63
    |
227 |         output.extend_from_slice(escape_tricky_unicode_str(ch.valid()).as_bytes());
    |                                                               ^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#incompatible_msrv

warning: current MSRV (Minimum Supported Rust Version) is `1.77.0` but this item is stable since `1.79.0`
   --> crev-lib/src/util/mod.rs:228:37
    |
228 |         output.extend_from_slice(ch.invalid());
    |                                     ^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#incompatible_msrv

warning: `crev-lib` (lib) generated 3 warnings
    Checking cargo-crev v0.26.3 (.../cargo-crev/cargo-crev)
warning: `crev-lib` (lib test) generated 3 warnings (3 duplicates)
warning: current MSRV (Minimum Supported Rust Version) is `1.77.0` but this item is stable since `1.82.0`
   --> cargo-crev/src/shared.rs:637:39
    |
637 |                 if args.diff.as_ref().is_none_or(|new_base| new_base == &latest.diff_base) {
    |                                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#incompatible_msrv
    = note: requested on the command line with `-W clippy::incompatible-msrv`

warning: `cargo-crev` (bin "cargo-crev") generated 1 warning
warning: `cargo-crev` (bin "cargo-crev" test) generated 1 warning (1 duplicate)
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.94s

Additionally, cargo-msrv reports that the cargo 0.85.0 dependency requires rust 1.82.0. In another PR I bumped it to 0.86.0 which requires rust 1.83.0.