* fix(deps): update dependency org.matrix.rustcomponents:sdk-android to v26.03.18
* Fix API breaks
* Add compatibility with rustls (#6367)
A new `rustls-platform-verifier-android` library has to be added to the project, it'll be called from Rust to get access to the certificates on Android.
Originally, this was supposed to be added as a local maven repo pointing to the rust crate that publishes the AAR, but that's just plain terrible (more details [here](https://github.com/rustls/rustls-platform-verifier#android).
Instead, what we can do is use a script that uses `cargo-download` to download the latest crate or a specified version, unzip it and add the `aar` file to the `:libraries:matrix:impl` module.
* Try fixing Sonar with local AAR files
* Remove `UserCertificatesProvider`: this is no longer needed after integrating rustls
* Added some docs for rustls and its `platform-verifier` library
* Upgrade SDK to `26.03.19`: this version contains a workaround that allows the app to use the same TLS verifier as before, fixing the Let's Encrypt issues we saw with some homeservers (like element.io)
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Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Jorge Martín <jorgem@element.io>
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