Make syntax consistent in test.yml

Co-authored-by: Takashi Kokubun <takashikkbn@gmail.com>

Author: eregon

.github/workflows/test.yml

@@ -44,17 +44,15 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - { ruby: ruby }
-          - { ruby: head }
-          - {
-              ruby: truffleruby,
-              # knucleotide: needs fork
-              # lobsters: commonmarker fails to install
-              # railsbench: NoMethodError: undefined method `[]=' for class Fiber (NoMethodError)
-              # ruby-lsp: rbs_extension.so: undefined symbol: ruby_vm_at_exit
-              # shipit: cannot load such file -- pty
-              extra_args: "--excludes=knucleotide,lobsters,railsbench,ruby-lsp,shipit"
-            }
+          - ruby: ruby
+          - ruby: head
+          - ruby: truffleruby
+            # knucleotide: needs fork
+            # lobsters: commonmarker fails to install
+            # railsbench: NoMethodError: undefined method `[]=' for class Fiber (NoMethodError)
+            # ruby-lsp: rbs_extension.so: undefined symbol: ruby_vm_at_exit
+            # shipit: cannot load such file -- pty
+            extra_args: "--excludes=knucleotide,lobsters,railsbench,ruby-lsp,shipit"
     if: ${{ github.event_name != 'schedule' || github.repository == 'ruby/ruby-bench' }}
     steps:
       - uses: actions/checkout@v3