Bump mockk from 1.11.0 to 1.12.0

Bumps [mockk](https://github.com/mockk/mockk) from 1.11.0 to 1.12.0.
- [Release notes](https://github.com/mockk/mockk/releases)
- [Commits](https://github.com/mockk/mockk/compare/1.11.0...v1.12.0)

---
updated-dependencies:
- dependency-name: io.mockk:mockk
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

matrix-sdk-android/build.gradle

@@ -175,7 +175,7 @@ dependencies {
     testImplementation 'org.robolectric:robolectric:4.5.1'
     //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 'io.mockk:mockk:1.11.0'
+    testImplementation 'io.mockk:mockk:1.12.0'
     testImplementation 'org.amshove.kluent:kluent-android:1.67'
     testImplementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:$kotlin_coroutines_version"
     // Plant Timber tree for test