fix: Bump eventsource client from v0.14.0 -> v0.16.0

Author: keelerm84

launchdarkly-server-sdk/Cargo.toml

@@ -20,7 +20,7 @@ features = ["event-compression"]
 chrono = "0.4.19"
 crossbeam-channel = "0.5.1"
 data-encoding = "2.3.2"
-eventsource-client = { version = "0.14.0", default-features = false }
+eventsource-client = { version = "0.16.0", default-features = false }
 futures = "0.3.12"
 lazy_static = "1.4.0"
 log = "0.4.14"