Cover and then remove `ancestor.send_type?` branch in `UnspecifiedException` #2391

Job	Run time
Confirm config and documentation	12s
Test coverage	17s
Ruby 2.7: internal_investigation	26s
Edge RuboCop: internal_investigation	14s
Ruby 2.7: spec	32s
Edge RuboCop: spec	19s
Oldest RuboCop: spec	20s
Ruby 3.0: internal_investigation	15s
Prism	30s
Ruby 3.0: spec	16s
Ruby 3.1: internal_investigation	18s
RSpec 4	18s
Ruby 3.1: spec	18s
Ruby 3.2: internal_investigation	15s
Ruby 3.2: spec	22s
Ruby 3.3: internal_investigation	15s
Ruby 3.3: spec	18s
Ruby ruby-head: internal_investigation	12s
Ruby ruby-head: spec	21s
Ruby jruby-9.4: internal_investigation	1m 19s
Ruby jruby-9.4: spec	1m 17s
	8m 34s

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