Merge pull request #19286 from lnicola/twiddle-ci

Twiddle with the `rustup` invocation on CI

Author: lnicola

.github/workflows/ci.yaml

@@ -67,8 +67,7 @@ jobs:
           rustup component add --toolchain ${{ env.RUST_CHANNEL }} rust-src
           # We always use a nightly rustfmt, regardless of channel, because we need
           # --file-lines.
-          rustup toolchain add nightly --profile minimal
-          rustup component add --toolchain nightly rustfmt
+          rustup toolchain install nightly --profile minimal --component rustfmt
       # https://github.com/actions-rust-lang/setup-rust-toolchain/blob/main/rust.json
       - name: Install Rust Problem Matcher
         if: matrix.os == 'ubuntu-latest'