TruffleRuby 21.0.0 works on macOS 11.0

Author: eregon

.github/workflows/test.yml

@@ -29,7 +29,6 @@ jobs:
         - { os: windows-2019, ruby: debug }
         - { os: windows-2019, ruby: truffleruby }
         - { os: windows-2019, ruby: truffleruby-head }
-        - { os: macos-11.0, ruby: truffleruby }
 
     name: ${{ matrix.os }} ${{ matrix.ruby }}
     runs-on: ${{ matrix.os }}