Bump mockkVersion from 1.12.2 to 1.12.3

Bumps `mockkVersion` from 1.12.2 to 1.12.3.

Updates `mockk` from 1.12.2 to 1.12.3
- [Release notes](https://github.com/mockk/mockk/releases)
- [Commits](https://github.com/mockk/mockk/compare/1.12.2...1.12.3)

Updates `mockk-android` from 1.12.2 to 1.12.3
- [Release notes](https://github.com/mockk/mockk/releases)
- [Commits](https://github.com/mockk/mockk/compare/1.12.2...1.12.3)

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

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

build.gradle

@@ -68,7 +68,7 @@ ext {
     androidLibraryVersion = "master-SNAPSHOT"
     mockitoVersion = "4.3.1"
     mockitoKotlinVersion = "4.0.0"
-    mockkVersion = "1.12.2"
+    mockkVersion = "1.12.3"
     powermockVersion = "2.0.9"
     byteBuddyVersion = "1.12.8"
     espressoVersion = "3.4.0"