chore(deps): bump rack from 3.1.9 to 3.1.10 in /buildpacks/buildpack-multi/tests/multi #1604

Job	Run time
build.20-true	4m 14s
build.20-true	4m 5s
build.22-true	3m 41s
build.22-true	3m 36s
build.24-true	4m 12s
build.24-true	4m 6s
build.20-false	4m 0s
build.20-false	3m 54s
build.22-false	4m 1s
build.22-false	3m 55s
build.24-false	3m 30s
build.24-false	3m 30s
unit.heroku-${{ matrix.heroku }}.${{ matrix.buildpack }}	0s
unit.heroku-${{ matrix.heroku }}.${{ matrix.buildpack }}	0s
	46m 44s

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