Bump rexml from 3.3.4 to 3.3.9 #2410

Job	Run time
test (3.2.2, Gemfile, default, false, sqlite3, :memory:, password)	32s
test (ruby-head, gemfiles/rails_master.gemfile, default, false, sqlite3, :memory:)	44s
static	7s
rbi-check	6s
test (2.7, gemfiles/rails_5.2.gemfile, default, false, sqlite3, :memory:)	50s
test (2.7, gemfiles/rails_6.0.gemfile, default, false, sqlite3, :memory:)	53s
test (2.7, gemfiles/rails_5.2.gemfile, default, false, sqlite3, :memory:)	52s
typecheck	7s
test (2.7, gemfiles/rails_6.0.gemfile, default, true, sqlite3, :memory:)	4m 53s
readme	7s
test (2.7, gemfiles/rails_6.0.gemfile, default, postgresql, ci_test, password, false)	52s
test (3, gemfiles/rails_7.0.gemfile, default, true, sqlite3, :memory:)	1m 42s
documentation	0s
	11m 45s

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