cleanup unused extern crates.

Signed-off-by: Jason Volk <jason@zemos.net>

src/core/Cargo.toml

@@ -71,16 +71,11 @@ perf_measurements = []
 sentry_telemetry = []
 
 [dependencies]
-async-trait.workspace = true
 axum-server.workspace = true
 axum.workspace = true
-base64.workspace = true
 bytes.workspace = true
-clap.workspace = true
-cyborgtime.workspace = true
 either.workspace = true
 figment.workspace = true
-futures-util.workspace = true
 http-body-util.workspace = true
 http.workspace = true
 image.workspace = true
@@ -89,7 +84,6 @@ ipaddress.workspace = true
 itertools.workspace = true
 libloading.workspace = true
 log.workspace = true
-lru-cache.workspace = true
 parking_lot.optional = true
 parking_lot.workspace = true
 rand.workspace = true
@@ -105,8 +99,6 @@ sanitize-filename.workspace = true
 serde_json.workspace = true
 serde_regex.workspace = true
 serde.workspace = true
-serde_yaml.workspace = true
-sha-1.workspace = true
 thiserror.workspace = true
 thread_local.optional = true
 thread_local.workspace = true