Fix: Address Android 11 crash.

Closes https://github.com/zcash/zcash-android-wallet-sdk/issues/198
Addresses the underlying issue behind https://github.com/horizontalsystems/unstoppable-wallet-android/issues/3013
by making the necessary changes to upgrade to the latest version of gRPC and grpc-okhttp.

build.gradle

@@ -12,7 +12,7 @@ buildscript {
             'room': '2.2.5',
             'paging': '2.1.2'
         ],
-        'grpc':'1.25.0', // NOTE: cannot use a higher version because they use protobuf 3.10+ which is not compatible with 3.0+ so we'd have to implement changes in our protobuf files which breaks everything
+        'grpc':'1.34.1',
         'coroutines': '1.3.9',
         'junitJupiter': '5.6.1'
     ]
@@ -33,7 +33,7 @@ buildscript {
         classpath "org.jetbrains.dokka:dokka-gradle-plugin:0.10.1"
         classpath "com.github.ben-manes:gradle-versions-plugin:0.31.0"
         classpath 'com.github.dcendents:android-maven-gradle-plugin:2.1'
-        classpath "com.google.protobuf:protobuf-gradle-plugin:0.8.13"
+        classpath "com.google.protobuf:protobuf-gradle-plugin:0.8.14"
         classpath 'com.getkeepsafe.dexcount:dexcount-gradle-plugin:1.0.2'
         classpath 'com.github.str4d:rust-android-gradle:68b4ecc053'
         classpath 'org.owasp:dependency-check-gradle:6.0.0'
@@ -173,16 +173,20 @@ dokka {
 
 protobuf {
     generatedFilesBaseDir = "$projectDir/src/generated/source/grpc"
-    protoc { artifact = 'com.google.protobuf:protoc:3.7.1' }
+    protoc { artifact = 'com.google.protobuf:protoc:3.14.0' }
     plugins {
         javalite { artifact = "com.google.protobuf:protoc-gen-javalite:3.0.0" }
         grpc { artifact = "io.grpc:protoc-gen-grpc-java:${versions.grpc}" }
     }
     generateProtoTasks {
         all().each { task ->
+            task.builtins {
+                java {
+                    option "lite"
+                }
+            }
             task.plugins {
-                javalite {}
-                grpc { // Options added to --grpc_out
+                grpc {
                     option 'lite'
                 }
             }
@@ -247,6 +251,16 @@ dependencies {
     // per this recommendation from Chris Povirk, given guava's decision to split ListenableFuture away from Guava: https://groups.google.com/d/msg/guava-discuss/GghaKwusjcY/bCIAKfzOEwAJ
     implementation 'com.google.guava:guava:27.0.1-android'
 
+    // Transitive dependencies used because they're already necessary for other libraries
+    // GSON is available as a transitive dependency from several places so we use it for processing
+    // checkpoints but also document that by explicitly including here. If dependencies like Room
+    // or grpc-okhttp stop including GSON, then we should switch to something else for parsing JSON.
+    implementation 'com.google.code.gson:gson:2.8.6'
+    // OKIO is a transitive dependency used when writing param files to disk. Like GSON, this can be
+    // replaced if needed. For compatibility, we match the library version used in grpc-okhttp:
+    // https://github.com/grpc/grpc-java/blob/v1.34.x/build.gradle#L154
+    implementation 'com.squareup.okio:okio:1.13.0'
+
     // Tests
     testImplementation 'androidx.multidex:multidex:2.0.1'
     testImplementation "org.jetbrains.kotlin:kotlin-reflect:${Deps.kotlinVersion}"