Bump tokio to 1.10 and add a test to confirm memory usage of rolling_total (#392)

backend/telemetry_core/Cargo.toml

@@ -31,7 +31,7 @@ smallvec = "1.6.1"
 soketto = "0.6.0"
 structopt = "0.3.21"
 thiserror = "1.0.25"
-tokio = { version = "1.7.0", features = ["full"] }
+tokio = { version = "1.10.1", features = ["full"] }
 tokio-util = { version = "0.6", features = ["compat"] }
 
 [dev-dependencies]