Update tracing-opentelemetry

Cargo.lock

@@ -3561,12 +3561,14 @@ dependencies = [
 
 [[package]]
 name = "tracing-opentelemetry"
-version = "0.20.0"
+version = "0.21.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fc09e402904a5261e42cf27aea09ccb7d5318c6717a9eec3d8e2e65c56b18f19"
+checksum = "75327c6b667828ddc28f5e3f169036cb793c3f588d83bf0f262a7f062ffed3c8"
 dependencies = [
  "once_cell",
  "opentelemetry",
+ "opentelemetry_sdk",
+ "smallvec",
  "tracing",
  "tracing-core",
  "tracing-log",

Cargo.toml

@@ -72,7 +72,7 @@ tracing = "0.1"
 tracing-error = "0.2"
 tracing-futures = "0.2"
 tracing-log = "0.1"
-tracing-opentelemetry = "0.20"
+tracing-opentelemetry = "0.21"
 tracing-subscriber = { version = "0.3", features = [
   "ansi",
   "env-filter",