Update Rust crate tokio to 1.21.2

Cargo.lock

@@ -885,9 +885,9 @@ dependencies = [
 
 [[package]]
 name = "tokio"
-version = "1.21.1"
+version = "1.21.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0020c875007ad96677dcc890298f4b942882c5d4eb7cc8f439fc3bf813dc9c95"
+checksum = "a9e03c497dc955702ba729190dc4aac6f2a0ce97f913e5b1b5912fc5039d9099"
 dependencies = [
  "autocfg",
  "bytes",
@@ -895,7 +895,6 @@ dependencies = [
  "memchr",
  "mio",
  "num_cpus",
- "once_cell",
  "parking_lot",
  "pin-project-lite",
  "signal-hook-registry",

Cargo.toml

@@ -13,7 +13,7 @@ name = "site"
 [dependencies]
 axum = { version = "0.5.16" }
 hyper = { version = "0.14.20" }
-tokio = { version = "1.21.1", features = ["full"] }
+tokio = { version = "1.21.2", features = ["full"] }
 tracing = "0.1.36"
 tracing-subscriber = {version = "0.3.15", features = ["env-filter"] }
 tower-http = { version = "0.3.4", features = ["fs", "trace", "auth"] }