[dart2] [client] Bump test package version to >=1.21.6 for dart3 compatability#17816

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wing328 merged 1 commit intoOpenAPITools:masterfrom

0xNF:Dart2_fix_test_too_old_version

Feb 28, 2024

Commits on Feb 8, 2024

[dart2] [client] Bump test package version to >=1.21.6<1.22.0 to enable running tests on Dart3 projects. Also bumped minimum Dart version to 2.18 to accomodate this change. (#17563)
0xNF
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