fix ci on windows

Author: dfalbel

.github/workflows/R-CMD-check.yaml

@@ -18,11 +18,11 @@ jobs:
       fail-fast: false
       matrix:
         config:
-          - {os: windows-latest, r: 'release', rust-version: 'stable-msvc'}
-          - {os: windows-latest, r: 'devel', rust-version: 'stable-msvc'}
+          - {os: windows-latest, r: 'release', rust-version: 'stable-msvc', rust-target: 'x86_64-pc-windows-gnu'}
+          - {os: windows-latest, r: 'devel',   rust-version: 'stable-msvc', rust-target: 'x86_64-pc-windows-gnu'}
           - {os: macOS-latest,   r: 'release', rust-version: 'stable'}
           - {os: ubuntu-latest,  r: 'release', rust-version: '1.81.0'}
-          - {os: ubuntu-latest,  r: 'devel', rust-version: 'stable'}
+          - {os: ubuntu-latest,  r: 'devel',   rust-version: 'stable'}
 
     env:
       R_REMOTES_NO_ERRORS_FROM_WARNINGS: true
@@ -31,17 +31,11 @@ jobs:
     steps:
       - uses: actions/checkout@v2
 
-      - uses: actions-rs/toolchain@v1
+      - uses: dtolnay/rust-toolchain@master
         with:
           toolchain: ${{ matrix.config.rust-version }}
-          default: true
-
-      - name: Add Rust targets for R < 4.2 on Windows
-        if: startsWith(runner.os, 'Windows') && matrix.config.r == '4.1'
-        run: |
-          rustup target add x86_64-pc-windows-gnu
-          rustup target add i686-pc-windows-gnu
-
+          targets: ${{ matrix.config.rust-target }}
+     
       - uses: r-lib/actions/setup-pandoc@v2
 
       - uses: r-lib/actions/setup-r@v2