fix(deps): update dependency org.matrix.rustcomponents:sdk-android to v26.03.19 (#6411)

* 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)

---------

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Jorge Martín <jorgem@element.io>

.github/workflows/sonar.yml

@@ -54,7 +54,7 @@ jobs:
         with:
           cache-read-only: ${{ github.ref != 'refs/heads/develop' }}
       - name: Build debug code and test fixtures
-        run: ./gradlew assembleDebug createFullJarDebugTestFixtures :app:createFullJarGplayDebugTestFixtures $CI_GRADLE_ARG_PROPERTIES
+        run: ./gradlew assembleGplayDebug createFullJarDebugTestFixtures :app:createFullJarGplayDebugTestFixtures $CI_GRADLE_ARG_PROPERTIES
       - name: 🔊 Publish results to Sonar
         env:
           SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}