gradle: add ndk version

Change-Id: Ib2d5e1135dbf7a8c14fb8a390f879ed9dc1e330c

docker/Dockerfile

@@ -53,10 +53,10 @@ ENV ANDROID_DEPS=\
  platforms;android-29 \
  extras;android;m2repository \
  extras;google;m2repository \
- ndk;20.0.5594570'
+ ndk;21.0.6113669'
 RUN (while sleep 1; do echo "y"; done) | sdkmanager $ANDROID_DEPS
 ENV ANDROID_SDK=/opt/android-sdk
-ENV ANDROID_NDK=/opt/android-sdk/ndk/20.0.5594570
+ENV ANDROID_NDK=/opt/android-sdk/ndk/21.0.6113669
 
 WORKDIR /home/builder/src
 VOLUME /home/builder/src

ring-android/app/build.gradle

@@ -5,6 +5,7 @@ def buildFirebase = project.hasProperty('buildFirebase') || getGradle().getStart
 android {
     compileSdkVersion 29
     buildToolsVersion '29.0.2'
+    ndkVersion "21.0.6113669"
     defaultConfig {
         minSdkVersion 21
         targetSdkVersion 29
@@ -69,8 +70,8 @@ android {
 dependencies {
     def android_support_core_version = '1.1.0'
     def android_support_version = '1.0.0'
-    def material_version = '1.1.0-rc01'
-    def butterknife_version = '10.2.0'
+    def material_version = '1.1.0-rc02'
+    def butterknife_version = '10.2.1'
     def dagger_version = '2.24'
 
     implementation fileTree(include: '*.jar', dir: 'libs')

ring-android/libringclient/build.gradle

@@ -17,13 +17,13 @@ dependencies {
     compile 'com.j256.ormlite:ormlite-core:5.1'
 
     // Required -- JUnit 4 framework
-    testCompile 'junit:junit:4.12'
+    testCompile 'junit:junit:4.13'
 
     // RxJava
     compile "io.reactivex.rxjava2:rxjava:2.2.16"
 
     // gson
-    compile 'com.google.code.gson:gson:2.8.5'
+    compile 'com.google.code.gson:gson:2.8.6'
 
 }