Bump phoenix from 1.7.18 to 1.7.21 in /tests/support/test_server#171

dependabot[bot] wants to merge 1 commit intomainliveview-native/phoenix-channels-client:mainfrom

dependabot/hex/tests/support/test_server/phoenix-1.7.21liveview-native/phoenix-channels-client:dependabot/hex/tests/support/test_server/phoenix-1.7.21Copy head branch name to clipboard