refactor: remove dead code (#3337)

fluxer_unfurl/Cargo.toml

@@ -13,7 +13,6 @@ chrono = { version = "0.4.45", default-features = false, features = ["std"] }
 encoding_rs = "0.8.41"
 entities = "1.0.1"
 fluxer-svc = { path = "../fluxer_svc", default-features = false }
-hmac = "0.13.0"
 infer = "0.22.0"
 moka = { version = "0.12.16", features = ["future", "sync"] }
 regex = "1.13"
@@ -21,7 +20,6 @@ reqwest = { version = "0.13.5", default-features = false, features = ["json", "r
 scraper = "0.27"
 serde = { version = "1.0.229", features = ["derive", "rc"] }
 serde_json = "1.0.151"
-sha2 = "0.11.0"
 tokio = { version = "1.53.1", features = ["macros", "net", "rt-multi-thread", "signal", "time"] }
 tracing = "0.1.44"
 url = "2.5"