chore: update github action versions

Author: FintanH

.github/workflows/actions.yml

@@ -14,7 +14,7 @@ jobs:
         os: ['ubuntu-latest', 'macos-latest']
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Build
         run: cargo build --verbose
         env:
@@ -28,7 +28,7 @@ jobs:
         os: ['ubuntu-latest', 'macos-latest']
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Build
         run: cargo build --verbose --no-default-features
         env:
@@ -40,15 +40,15 @@ jobs:
     name: Check rustfmt style && run clippy
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: actions-rs/toolchain@v1
         with:
           toolchain: stable
           profile: minimal
           components: clippy, rustfmt
           override: true
       - name: Cache cargo registry
-        uses: actions/cache@v1
+        uses: actions/cache@v4
         with:
           path: ~/.cargo/registry
           key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}