update git actions to newer versions

Author: multicatch

.github/workflows/main.yml

@@ -15,11 +15,9 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Install latest rust toolchain
-        uses: actions-rs/toolchain@v1
+      - uses: actions-rust-lang/setup-rust-toolchain@v1
         with:
           toolchain: stable
-          default: true
-          override: true
 
       - name: Test
         run: cargo clippy -- -Dwarnings && cargo test
@@ -52,7 +50,7 @@ jobs:
           path: target
 
       - name: Deploy to GitHub Pages
-        uses: JamesIves/github-pages-deploy-action@4.1.1
+        uses: JamesIves/github-pages-deploy-action@v4
         with:
           branch: gh-pages
           folder: 'target/doc'