GHSA-fc4h-xcf3-qj5f matrix-sdk 0.6.0 logs access tokens

• crates.io matrix-sdk: >= 0.6.0, < 0.6.2 → fixed in 0.6.2

When sending Matrix requests using an affected version of `matrix-sdk` in an application that writes logs using `tracing-subscriber` (in a way that includes fields of tracing spans such as `tracing_subscriber`s default text output from the `fmt` module), these logs will contain the user's access token.