Bump rack from 3.2.1 to 3.2.5 in /rails_app #157

Job	Run time
build-lint-test (macos-latest, 3.3)	1m 26s
build-lint-test (ubuntu-latest, 3.3)	1m 59s
build-lint-test (ubuntu-latest, 4.0)	17m 53s
build-lint-test (macos-latest, 4.0)	10m 10s
	31m 28s

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