Update git submodules

* Update prebuilts/androidx/external from branch 'androidx-master-dev'
  to b5a530c602753b39fd05a453332b2416647b1477
  - Merge "Update to dokka 1.4.20-dev-1" into androidx-master-dev
  - Update to dokka 1.4.20-dev-1
    
    ./development/importMaven/import_maven_artifacts.py -ab -n 'org.jetbrains.dokka:dokka-base:1.4.20-dev-1'
    ./development/importMaven/import_maven_artifacts.py -ab -n 'org.jetbrains.dokka:dokka-cli:1.4.20-dev-1'
    ./development/importMaven/import_maven_artifacts.py -ab -n 'org.jetbrains.dokka:dokka-core:1.4.20-dev-1'
    ./development/importMaven/import_maven_artifacts.py -ab -n 'org.jetbrains.dokka:dokka-analysis:1.4.20-dev-1'
    ./development/importMaven/import_maven_artifacts.py -ab -n 'org.jetbrains.dokka:dokka-test-api:1.4.20-dev-1'
    ./development/importMaven/import_maven_artifacts.py -ab -n 'org.jetbrains.dokka:kotlin-analysis-compiler:1.4.20-dev-1'
    ./development/importMaven/import_maven_artifacts.py -ab -n 'org.jetbrains.dokka:kotlin-analysis-intellij:1.4.20-dev-1'
    ./development/importMaven/import_maven_artifacts.py -ab -n 'org.jetbrains.kotlin:kotlin-stdlib:1.4.10'
    ./development/importMaven/import_maven_artifacts.py -ab -n 'org.jetbrains.kotlin:kotlin-reflect:1.4.10'
    ./development/importMaven/import_maven_artifacts.py -ab -n 'org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.4.10'
    
    Test: ./gradlew
    Change-Id: I22cc6a26a10986a8891e3cad346782f8a7e7f472
    
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