Remove ruby-core workflow (ruby#1075)

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.
tompng · Jan 26, 2025 · 876bfcc · 876bfcc
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commit 876bfcc
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diff --git a/.github/workflows/ruby-core.yml b/.github/workflows/ruby-core.yml