Bump rack-session from 2.1.1 to 2.1.2 in /rails_app #186

Job	Run time
build-lint-test (ubuntu-latest, 4.0)	17m 7s
build-lint-test (ubuntu-latest, 3.3)	2m 8s
build-lint-test (macos-latest, 4.0)	7m 42s
build-lint-test (macos-latest, 3.3)	1m 26s
	28m 23s

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