refactor: Update near-sdk-rs from 4.1.1 to 5.0.0-alpha.2 (#87)

- Updated near-sdk-rs from 4.1.1 to 5.0.0-alpha.2
- Updated near-sdk-rs in community and community-factory from
5.0.0-alpha.1 to 5.0.0-alpha.2
- Added #[borsh(crate = "near_sdk::borsh")] where it was necessary
- Added #[derive(Ord)] where it was necessary
- Used pub type Balance = u128; instead of  near_sdk::Balance
- Changed gas type for new one (including usage of construction and
operations with gas - div / sub / etc)
- Changed version.try_to_vec() to borsh::to_vec(&version)
- Changed u128 to NearToken
- Changed toolchain from 1.69.0 to 1.75.0 as in Near core
- Updated packages chrono and near-workspaces

.github/workflows/main.yml

@@ -11,12 +11,6 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v2
-      - name: Install Rust
-        uses: actions-rs/toolchain@v1
-        with:
-          profile: minimal
-          toolchain: 1.68.2
-          default: true
       - uses: Swatinem/rust-cache@v1
       - run: rustup target add wasm32-unknown-unknown
       - name: Build community contract

.github/workflows/release.yml

@@ -16,12 +16,6 @@ jobs:
     steps:
     - name: Checkout repository
       uses: actions/checkout@v2
-    - name: Install Rust
-      uses: actions-rs/toolchain@v1
-      with:
-        profile: minimal
-        toolchain: 1.68.2
-        default: true
     - uses: Swatinem/rust-cache@v1
     - run: rustup target add wasm32-unknown-unknown
     - name: Build community contract