Fix Ruby 4.0 warning in default before_template and after_template (#… #2288

Job	Run time
rubocop	43s
tests (ubuntu-latest, truffleruby)	1m 41s
tests (ubuntu-latest, head)	1m 6s
tests (macos-latest, 4.0)	28s
tests (ubuntu-latest, 3.3)	41s
tests (macos-latest, truffleruby-head)	1m 58s
tests (ubuntu-latest, truffleruby-head)	1m 32s
tests (macos-latest, 3.3)	27s
tests (ubuntu-latest, 3.4)	41s
tests (macos-latest, 3.4)	26s
tests (ubuntu-latest, 4.0)	37s
tests (ubuntu-latest, 3.2)	39s
tests (macos-latest, truffleruby)	2m 10s
tests (macos-latest, head)	1m 31s
tests (macos-latest, 3.2)	49s
	15m 29s

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