Fix some gradle deprecation warnings (#4895)

Author: rlazo

build.gradle

@@ -36,7 +36,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.google.protobuf:protobuf-gradle-plugin:0.8.14'
+        classpath 'com.google.protobuf:protobuf-gradle-plugin:0.9.2'
         classpath 'net.ltgt.gradle:gradle-errorprone-plugin:1.3.0'
         classpath 'gradle.plugin.com.github.sherter.google-java-format:google-java-format-gradle-plugin:0.9'
         classpath 'com.google.gms:google-services:4.3.15'

buildSrc/src/main/java/com/google/firebase/gradle/plugins/ci/Coverage.java

@@ -36,7 +36,7 @@ public static void apply(FirebaseLibraryExtension firebaseLibrary) {
     JacocoPluginExtension jacoco = project.getExtensions().getByType(JacocoPluginExtension.class);
 
     jacoco.setToolVersion("0.8.8");
-    jacoco.setReportsDir(reportsDir);
+    jacoco.getReportsDirectory().set(reportsDir);
     project
         .getTasks()
         .withType(

buildSrc/src/main/java/com/google/firebase/gradle/plugins/license/GenerateLicensesTask.java

@@ -32,7 +32,7 @@
 import org.gradle.api.tasks.Input;
 import org.gradle.api.tasks.OutputDirectory;
 import org.gradle.api.tasks.TaskAction;
-import org.gradle.api.tasks.incremental.IncrementalTaskInputs;
+import org.gradle.work.InputChanges;
 
 abstract class GenerateLicensesTask extends DefaultTask {
   private static final int NEW_LINE_LENGTH = "\n".getBytes().length;
@@ -56,7 +56,7 @@ public GenerateLicensesTask() {
   }
 
   @TaskAction
-  void execute(IncrementalTaskInputs inputs) {
+  void execute(InputChanges inputs) {
     Set<URI> licenseUris = new HashSet<URI>();
     for (ThirdPartyLicensesExtension.CustomLicense license : getadditionalLicenses()) {
       licenseUris.addAll(license.licenseUris);