Bump phoenix from 1.7.18 to 1.8.0 in /tests/support/test_server #160

Job	Run time
fmt	8s
clippy	32s
integration_tests	3m 11s
typos	10s
apple_simulator_integration_tests (aarch64-apple-tvos-sim, tvOS, -Zbuild-std)	3m 37s
uniffi-check	57s
apple_simulator_integration_tests (aarch64-apple-watchos-sim, watchOS, -Zbuild-std)	7m 20s
android_simulator_integration_tests	6m 14s
apple_simulator_integration_tests (aarch64-apple-ios-sim, iOS)	7m 37s
	29m 46s

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