Update Rust crate matrix-sdk to 0.6.2

Author: renovate[bot]

Cargo.toml

@@ -20,7 +20,7 @@ anyhow = "1.0.43"
 serde = "1.0.129"
 serde_json = "1.0.66"
 serde_yaml = "0.8.20"
-matrix-sdk = "0.3.0"
+matrix-sdk = "0.6.2"
 ruma = "0.2.0"
 actix = "0.12.0"
 actix-web = "4.0.0-beta.9"