feat: depending on hickory-dns 0.25-alpha.4 specifically

- ref #1775

Author: zonyitoo

crates/shadowsocks-service/Cargo.toml

@@ -180,7 +180,7 @@ http-body-util = { version = "0.1", optional = true }
 http = { version = "1.1", optional = true }
 httparse = { version = "1.9", optional = true }
 
-hickory-resolver = { version = "0.25.0-alpha", optional = true, features = [
+hickory-resolver = { version = "=0.25.0-alpha.4", optional = true, features = [
     "serde",
 ] }
 

crates/shadowsocks/Cargo.toml

@@ -86,7 +86,7 @@ tokio = { version = "1.9.0", features = [
     "time",
 ] }
 
-hickory-resolver = { version = "0.25.0-alpha", optional = true }
+hickory-resolver = { version = "=0.25.0-alpha.4", optional = true }
 arc-swap = { version = "1.7", optional = true }
 notify = { version = "7.0", optional = true }