Bump rexml from 3.4.1 to 3.4.2 in /spec/bundler/realworld/fixtures/warbler in the bundler group across 1 directory #707

Job	Run time
make (check, --enable-shared --enable-load-relative)	8m 5s
make (test-bundled-gems)	21m 25s
make (check, ubuntu-24.04, capi)	9m 56s
make (check, cppflags=-DVM_CHECK_MODE)	9m 21s
make (check, i686)	12m 9s
make (test-bundler-parallel, 50)	28m 40s
make (check, --disable-yjit)	7m 50s
Ubuntu result	3s
	1h 37m 29s

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