Bump robolectric from 4.6.1 to 4.7

Bumps [robolectric](https://github.com/robolectric/robolectric) from 4.6.1 to 4.7.
- [Release notes](https://github.com/robolectric/robolectric/releases)
- [Commits](robolectric/robolectric@robolectric-4.6.1...robolectric-4.7)

---
updated-dependencies:
- dependency-name: org.robolectric:robolectric
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

matrix-sdk-android/build.gradle

@@ -159,7 +159,7 @@ dependencies {
     implementation 'com.googlecode.libphonenumber:libphonenumber:8.12.37'
 
     testImplementation libs.tests.junit
-    testImplementation 'org.robolectric:robolectric:4.6.1'
+    testImplementation 'org.robolectric:robolectric:4.7'
     //testImplementation 'org.robolectric:shadows-support-v4:3.0'
     // Note: version sticks to 1.9.2 due to https://github.com/mockk/mockk/issues/281
     testImplementation libs.mockk.mockk