refactor(dependencies): Move webrick to be a pure development dependency. #223

Job	Run time
test-with-rack-2 (3.2, ubuntu-latest)	41s
test-with-active-support (2.7, ubuntu-latest)	54s
test-with-rack-2 (3.2, windows-latest)	4m 51s
test (2.7, ubuntu-latest)	47s
test-with-active-support (2.7, windows-latest)	5m 47s
test-with-rack-2 (3.2, macos-latest)	36s
test (2.7, windows-latest)	5m 1s
test-with-active-support (2.7, macos-latest)	50s
test (2.7, macos-latest)	54s
test (3.0, ubuntu-latest)	39s
test-with-active-support (3.0, ubuntu-latest)	49s
test (3.0, windows-latest)	3m 48s
test-with-active-support (3.0, windows-latest)	4m 34s
test (3.0, macos-latest)	42s
test-with-active-support (3.0, macos-latest)	32s
test (3.1, ubuntu-latest)	40s
test-with-active-support (3.1, ubuntu-latest)	55s
test (3.1, windows-latest)	3m 54s
test-with-active-support (3.1, windows-latest)	4m 45s
test (3.1, macos-latest)	56s
test-with-active-support (3.1, macos-latest)	32s
test (3.2, ubuntu-latest)	41s
test-with-active-support (3.2, ubuntu-latest)	35s
test (3.2, windows-latest)	4m 1s
test-with-active-support (3.2, windows-latest)	4m 16s
test (3.2, macos-latest)	35s
test-with-active-support (3.2, macos-latest)	27s
test (3.3, ubuntu-latest)	37s
test (3.3, windows-latest)	4m 7s
test (3.3, macos-latest)	38s
	59m 4s

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