[#Fix 334] Make `body` consistent for `RescueNode`, `EnsureNode` and `KeywordBeginNode` #1213

Job	Run time
Prism	23s
Specs \| 2.7	35s
Specs \| 3.0	24s
Coding Style \| 3.0	31s
Specs \| 3.1	38s
Specs \| 3.2	24s
Main Gem Specs \| RuboCop: master \| 2.7	1m 54s
Specs \| 3.3	23s
Main Gem Specs \| RuboCop: master \| 3.0	1m 47s
Main Gem Specs \| RuboCop: v1.61.0 \| 3.3	1m 55s
Specs \| head	24s
Coverage \| 2.7	42s
Specs "modern" \| 3.0	23s
Specs \| jruby	46s
Specs \| jruby-head	47s
Specs \| truffleruby	51s
Specs \| truffleruby-head	1m 2s
	13m 49s

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