fix: example/animal-service/Gemfile to reduce vulnerabilities #229

Job	Run time
test-with-rack-2 (3.2, ubuntu-latest)	43s
test (2.7, ubuntu-latest)	38s
test-with-rack-2 (3.2, windows-latest)	4m 7s
test-with-active-support (2.7, ubuntu-latest)	49s
test (2.7, windows-latest)	4m 5s
test-with-rack-2 (3.2, macos-latest)	35s
test-with-active-support (2.7, windows-latest)	4m 20s
test (2.7, macos-latest)	41s
test-with-active-support (2.7, macos-latest)	57s
test (3.0, ubuntu-latest)	27s
test-with-active-support (3.0, ubuntu-latest)	27s
test (3.0, windows-latest)	2m 52s
test-with-active-support (3.0, windows-latest)	3m 28s
test (3.0, macos-latest)	24s
test-with-active-support (3.0, macos-latest)	27s
test (3.1, ubuntu-latest)	24s
test-with-active-support (3.1, ubuntu-latest)	36s
test (3.1, windows-latest)	3m 21s
test-with-active-support (3.1, windows-latest)	3m 38s
test (3.1, macos-latest)	24s
test-with-active-support (3.1, macos-latest)	29s
test (3.2, ubuntu-latest)	29s
test-with-active-support (3.2, ubuntu-latest)	34s
test (3.2, windows-latest)	2m 59s
test-with-active-support (3.2, windows-latest)	3m 20s
test (3.2, macos-latest)	22s
test-with-active-support (3.2, macos-latest)	29s
test (3.3, ubuntu-latest)	27s
test (3.3, windows-latest)	4m 28s
test (3.3, macos-latest)	26s
	47m 26s

Provide feedback