bump version to 2.2 (opensearch-project#446) (opensearch-project#454)

Signed-off-by: Ashish Agrawal <ashisagr@amazon.com>
(cherry picked from commit 4ab5ec2)

Co-authored-by: Ashish Agrawal <ashisagr@amazon.com>

build.gradle

@@ -14,9 +14,9 @@ import java.util.function.Predicate
 buildscript {
     ext {
         isSnapshot = "true" == System.getProperty("build.snapshot", "true")
-        opensearch_version = System.getProperty("opensearch.version", "2.1.0-SNAPSHOT")
+        opensearch_version = System.getProperty("opensearch.version", "2.2.0-SNAPSHOT")
         buildVersionQualifier = System.getProperty("build.version_qualifier", "")
-        // 2.0.0-SNAPSHOT -> 2.0.0.0-SNAPSHOT
+        // 2.2.0-SNAPSHOT -> 2.2.0.0-SNAPSHOT
         version_tokens = opensearch_version.tokenize('-')
         opensearch_build = version_tokens[0] + '.0'
         job_scheduler_no_snapshot = opensearch_build
@@ -185,7 +185,7 @@ dependencies {
     testImplementation "org.opensearch.test:framework:${opensearch_version}"
     testImplementation "org.jetbrains.kotlin:kotlin-test:${kotlin_version}"
     testImplementation "com.nhaarman.mockitokotlin2:mockito-kotlin:2.2.0"
-    testImplementation "org.mockito:mockito-core:4.3.1"
+    testImplementation "org.mockito:mockito-core:4.6.1"
 
     add("ktlint", "com.pinterest:ktlint:0.45.1") {
         attributes {