Remove ruby-core workflow

Since IRB is not a default gem anymore, we don't need to run CI against Ruby core anymore, at least not in the current form.
ruby · Jan 25, 2025 · 3b91f8d · 3b91f8d
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commit 3b91f8d
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diff --git a/.github/workflows/ruby-core.yml b/.github/workflows/ruby-core.yml