Revert "Try to test with truffleruby"

This reverts commit 639948f.

Author: hsbt

.github/workflows/test.yml

@@ -6,7 +6,7 @@ jobs:
   ruby-versions:
     uses: ruby/actions/.github/workflows/ruby_versions.yml@master
     with:
-      engine: cruby-truffleruby
+      engine: cruby
 
   test:
     needs: ruby-versions
@@ -17,9 +17,6 @@ jobs:
         os: [ ubuntu-latest, macos-latest, windows-latest ]
         exclude:
         - { os: windows-latest , ruby: head }
-        - { os: windows-latest , ruby: truffleruby }
-        - { os: windows-latest , ruby: truffleruby-head }
-        - { os: macos-latest ,   ruby: truffleruby } # https://github.com/oracle/truffleruby/issues/2872
         include:
         - { os: windows-latest , ruby: mingw }
         - { os: windows-latest , ruby: mswin }