chore: remove rack from Gemfile as it is brought in by activesupport #179

Job	Run time
test-with-rack-2 (3.2, ubuntu-latest)	55s
test-with-rack-2 (3.2, windows-latest)	5m 13s
test-with-rack-2 (3.2, macos-latest)	41s
test-with-active-support (2.7, ubuntu-latest)	52s
test (2.7, ubuntu-latest)	49s
test-with-active-support (2.7, windows-latest)	6m 33s
test (2.7, windows-latest)	5m 17s
test-with-active-support (2.7, macos-latest)	45s
test (2.7, macos-latest)	42s
test-with-active-support (3.0, ubuntu-latest)	36s
test (3.0, ubuntu-latest)	41s
test-with-active-support (3.0, windows-latest)	4m 16s
test-with-active-support (3.0, macos-latest)	31s
test (3.0, windows-latest)	2m 35s
test-with-active-support (3.1, ubuntu-latest)	38s
test (3.0, macos-latest)	33s
test-with-active-support (3.1, windows-latest)	4m 47s
test (3.1, ubuntu-latest)	41s
test-with-active-support (3.1, macos-latest)	35s
test (3.1, windows-latest)	2m 43s
test-with-active-support (3.2, ubuntu-latest)	38s
test (3.1, macos-latest)	39s
test-with-active-support (3.2, windows-latest)	5m 31s
test (3.2, ubuntu-latest)	37s
test-with-active-support (3.2, macos-latest)	32s
test (3.2, windows-latest)	3m 40s
test (3.2, macos-latest)	39s
test (3.3, ubuntu-latest)	43s
test (3.3, windows-latest)	3m 56s
test (3.3, macos-latest)	34s
	57m 52s

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