Update Rust crate tokio to 1.21

Cargo.lock

@@ -579,9 +579,9 @@ dependencies = [
 
 [[package]]
 name = "tokio"
-version = "1.20.0"
+version = "1.21.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "57aec3cfa4c296db7255446efb4928a6be304b431a806216105542a67b6ca82e"
+checksum = "a9e03c497dc955702ba729190dc4aac6f2a0ce97f913e5b1b5912fc5039d9099"
 dependencies = [
  "autocfg",
  "bytes",
@@ -589,7 +589,6 @@ dependencies = [
  "memchr",
  "mio",
  "num_cpus",
- "once_cell",
  "parking_lot",
  "pin-project-lite",
  "signal-hook-registry",

src/cmd/prae/Cargo.toml

@@ -6,7 +6,7 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-tokio = { version = "1.0", features = ["full"] }
+tokio = { version = "1.21", features = ["full"] }
 tracing = "0.1"
 tracing-subscriber = { version = "0.3", features = ["env-filter"] }
 anyhow = {version = "1.0.66"}

src/lib/prae_api/Cargo.toml

@@ -9,7 +9,7 @@ edition = "2021"
 axum = { version = "0.4" }
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0.68"
-tokio = { version = "1.0", features = ["full"] }
+tokio = { version = "1.21", features = ["full"] }
 tracing = "0.1"
 tracing-subscriber = { version = "0.3" }
 anyhow = { version = "1.0.66" }