Auto merge of rust-lang#2565 - RalfJung:ci, r=RalfJung

remove macOS work-around that is no longer needed

Judging from actions/cache#403 it sounds like this work-around is not needed any more.

src/tools/miri/.github/workflows/ci.yml

@@ -38,14 +38,6 @@ jobs:
  if: runner.os == 'Linux'
  run: echo "MIRIFLAGS=-Zmiri-tag-gc=1" >> $GITHUB_ENV
 
- # We install gnu-tar because BSD tar is buggy on macOS builders of GHA.
- # See <https://github.com/actions/cache/issues/403>.
- - name: Install GNU tar
- if: runner.os == 'macOS'
- run: |
- brew install gnu-tar
- echo "/usr/local/opt/gnu-tar/libexec/gnubin" >> $GITHUB_PATH
-
  # Cache the global cargo directory, but NOT the local `target` directory which
  # we cannot reuse anyway when the nightly changes (and it grows quite large
  # over time).