Remove usages of deprecated actions-rs (#43)

Author: johnthagen

.github/workflows/build.yml

@@ -12,10 +12,9 @@ jobs:
     runs-on: ${{ matrix.platform }}
     steps:
       - uses: actions/checkout@v3
-      - uses: actions-rs/toolchain@v1
+      - uses: dtolnay/rust-toolchain@master
         with:
           toolchain: ${{ matrix.toolchain }}
-          override: true
       - name: Build
         run: cargo build --release --all-features
   no_std:
@@ -27,10 +26,9 @@ jobs:
     runs-on: ${{ matrix.platform }}
     steps:
       - uses: actions/checkout@v3
-      - uses: actions-rs/toolchain@v1
+      - uses: dtolnay/rust-toolchain@master
         with:
           toolchain: ${{ matrix.toolchain }}
-          override: true
       - name: Build
         working-directory: no_std
         run: cargo build --release --all-features
@@ -42,10 +40,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
-      - uses: actions-rs/toolchain@v1
+      - uses: dtolnay/rust-toolchain@master
         with:
           toolchain: nightly
-          override: true
       - name: Build
         working-directory: ${{ matrix.project_dir }}
         run: >