Bump tokio from 1.11.0 to 1.13.1 in /api

Bumps [tokio](https://github.com/tokio-rs/tokio) from 1.11.0 to 1.13.1.
- [Release notes](https://github.com/tokio-rs/tokio/releases)
- [Commits](https://github.com/tokio-rs/tokio/compare/tokio-1.11.0...tokio-1.13.1)

---
updated-dependencies:
- dependency-name: tokio
  dependency-type: direct:production
...

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

api/Cargo.lock

@@ -911,9 +911,9 @@ checksum = "cda74da7e1a664f795bb1f8a87ec406fb89a02522cf6e50620d016add6dbbf5c"
 
 [[package]]
 name = "tokio"
-version = "1.11.0"
+version = "1.13.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b4efe6fc2395938c8155973d7be49fe8d03a843726e285e100a8a383cc0154ce"
+checksum = "52963f91310c08d91cb7bff5786dfc8b79642ab839e188187e92105dbfb9d2c8"
 dependencies = [
  "autocfg",
  "bytes",