test: Use XCTestExpectation for HttpDateParser #32

Job	Run time
Sentry/HybridSDK	1m 55s
Sentry dynamic ios	4m 32s
Sentry static ios	5m 22s
Sentry static macos	2m 14s
Sentry dynamic macos	2m 24s
Sentry static watchos	2m 45s
Sentry dynamic tvos	2m 6s
Sentry static tvos	2m 5s
Sentry dynamic watchos	2m 29s
SentrySwiftUI static ios	1m 27s
SentrySwiftUI static macos	2m 9s
SentrySwiftUI dynamic watchos	1m 51s
SentrySwiftUI static watchos	1m 31s
SentrySwiftUI dynamic macos	1m 29s
SentrySwiftUI dynamic ios	1m 16s
SentrySwiftUI dynamic tvos	1m 59s
SentrySwiftUI static tvos	1m 14s
	38m 48s

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