chore: bump nearcore to 2.4.0 rc.1, Rust toolchain to 1.82.0

[alexander-borodulya]

Reason for updating the Rust toolchain to 1.82.0

A borealis-engine-lib build pointing to nearcore 2.4.0-rc.1 has failed due to a version conflict between the syn crate versions required by different dependencies:

1. thiserror-impl v2.0.0 requires syn ^2.0.87.
2. actix-macros v0.2.4 requires syn ^2.0.79.

borealis-engine-lib % cargo check
    Updating git repository `https://github.com/near/nearcore`
    Updating crates.io index
error: failed to select a version for `syn`.
    ... required by package `thiserror-impl v2.0.0`
    ... which satisfies dependency `thiserror-impl = "=2.0.0"` of package `thiserror v2.0.0`
    ... which satisfies dependency `thiserror = "^2.0"` of package `near-crypto v2.4.0-rc.1 (https://github.com/near/nearcore?tag=2.4.0-rc.1#a83c1849)`
    ... which satisfies git dependency `near-crypto` of package `aurora-refiner-types v0.29.0-2.4.0-rc.1 (/Path/to/borealis-engine-lib/refiner-types)`
    ... which satisfies path dependency `aurora-refiner-types` of package `aurora-refiner v0.29.0-2.4.0-rc.1 (/Path/to/borealis-engine-lib/refiner-app)`
versions that meet the requirements `^2.0.87` are: 2.0.87

all possible versions conflict with previously selected packages.

  previously selected package `syn v2.0.79`
    ... which satisfies dependency `syn = "^2"` (locked to 2.0.79) of package `actix-macros v0.2.4`
    ... which satisfies dependency `actix-macros = "^0.2"` (locked to 0.2.4) of package `actix v0.13.5`
    ... which satisfies dependency `actix = "=0.13.5"` (locked to 0.13.5) of package `aurora-refiner v0.29.0-2.4.0-rc.1 (/Path/to/borealis-engine-lib/refiner-app)`

failed to select a version for `syn` which could resolve this conflict

Updating deps to the latest compatible versions and running cargo check again shows:

borealis-engine-lib % cargo update
    Updating crates.io index
    ...
borealis-engine-lib % cargo check
error: rustc 1.81.0 is not supported by the following packages:
  near-chunks@2.4.0-rc.1 requires rustc 1.82.0
  near-client@2.4.0-rc.1 requires rustc 1.82.0
  near-epoch-manager@2.4.0-rc.1 requires rustc 1.82.0
  near-indexer@2.4.0-rc.1 requires rustc 1.82.0
  near-jsonrpc@2.4.0-rc.1 requires rustc 1.82.0
  near-jsonrpc-client@2.4.0-rc.1 requires rustc 1.82.0
  near-mainnet-res@2.4.0-rc.1 requires rustc 1.82.0
  near-network@2.4.0-rc.1 requires rustc 1.82.0
  near-network@2.4.0-rc.1 requires rustc 1.82.0
  near-network@2.4.0-rc.1 requires rustc 1.82.0
  near-performance-metrics-macros@2.4.0-rc.1 requires rustc 1.82.0
  near-pool@2.4.0-rc.1 requires rustc 1.82.0
  near-rosetta-rpc@2.4.0-rc.1 requires rustc 1.82.0
  near-store@2.4.0-rc.1 requires rustc 1.82.0
  near-telemetry@2.4.0-rc.1 requires rustc 1.82.0
  near-wallet-contract@2.4.0-rc.1 requires rustc 1.82.0
  near-wallet-contract@2.4.0-rc.1 requires rustc 1.82.0
  near-wallet-contract@2.4.0-rc.1 requires rustc 1.82.0
  nearcore@2.4.0-rc.1 requires rustc 1.82.0
  node-runtime@2.4.0-rc.1 requires rustc 1.82.0
Either upgrade rustc or select compatible dependency versions with
`cargo update <name>@<current-ver> --precise <compatible-ver>`
where `<compatible-ver>` is the latest version supporting rustc 1.81.0