cargo: bump tokio from 1.20.1 to 1.21.2

Bumps [tokio](https://github.com/tokio-rs/tokio) from 1.20.1 to 1.21.2.
- [Release notes](https://github.com/tokio-rs/tokio/releases)
- [Commits](https://github.com/tokio-rs/tokio/compare/tokio-1.20.1...tokio-1.21.2)

---
updated-dependencies:
- dependency-name: tokio
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Cargo.lock

@@ -3478,9 +3478,9 @@ checksum = "cda74da7e1a664f795bb1f8a87ec406fb89a02522cf6e50620d016add6dbbf5c"
 
 [[package]]
 name = "tokio"
-version = "1.20.1"
+version = "1.21.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7a8325f63a7d4774dd041e363b2409ed1c5cbbd0f867795e661df066b2b0a581"
+checksum = "a9e03c497dc955702ba729190dc4aac6f2a0ce97f913e5b1b5912fc5039d9099"
 dependencies = [
  "autocfg",
  "bytes",
@@ -3488,7 +3488,6 @@ dependencies = [
  "memchr",
  "mio",
  "num_cpus",
- "once_cell",
  "parking_lot",
  "pin-project-lite",
  "signal-hook-registry",

deltachat-jsonrpc/Cargo.toml

@@ -24,7 +24,7 @@ futures = { version = "0.3.24" }
 serde_json = "1.0.85"
 yerpc = { version = "^0.3.1", features = ["anyhow_expose"] }
 typescript-type-def = { version = "0.5.3", features = ["json_value"] }
-tokio = { version = "1.19.2" }
+tokio = { version = "1.21.2" }
 
 # optional dependencies
 axum = { version = "0.5.16", optional = true, features = ["ws"] }
@@ -32,7 +32,7 @@ env_logger = { version = "0.9.1", optional = true }
 walkdir = "2.3.2"
 
 [dev-dependencies]
-tokio = { version = "1.19.2", features = ["full", "rt-multi-thread"] }
+tokio = { version = "1.21.2", features = ["full", "rt-multi-thread"] }
 
 
 [features]