Fix build script to run with Gradle 7

Author: andsel

CHANGELOG.md

@@ -1,3 +1,6 @@
+## Unreleased
+  - Fix: update to Gradle 7 [#184](https://github.com/logstash-plugins/logstash-input-tcp/pull/184)
+
 ## 6.2.1
   - Fix: restore logic to add the Bouncy-Castle security provider at runtime [#181](https://github.com/logstash-plugins/logstash-input-tcp/pull/181)
     - required to properly read encrypted (legacy) OpenSSL PKCS#5v1.5 keys

build.gradle

@@ -20,7 +20,7 @@ import static java.nio.file.StandardCopyOption.REPLACE_EXISTING
  * under the License.
  */
 apply plugin: "java"
-apply plugin: 'maven'
+apply plugin: 'maven-publish'
 apply plugin: "distribution"
 apply plugin: "idea"
 
@@ -32,11 +32,11 @@ sourceCompatibility = JavaVersion.VERSION_1_8
 buildscript {
   repositories {
     mavenCentral()
-    jcenter()
+    gradlePluginPortal()
   }
 
   dependencies {
-    classpath 'com.github.jengelman.gradle.plugins:shadow:4.0.4'
+    classpath 'gradle.plugin.com.github.jengelman.gradle.plugins:shadow:7.0.0'
   }
 }
 
@@ -51,10 +51,10 @@ shadowJar {
 }
 
 dependencies {
-  compile 'io.netty:netty-all:4.1.65.Final'
+  implementation 'io.netty:netty-all:4.1.65.Final'
 
-  compile group: 'commons-io', name: 'commons-io', version: '2.8.0'
-  compile 'org.apache.logging.log4j:log4j-core:2.9.1'
+  implementation group: 'commons-io', name: 'commons-io', version: '2.8.0'
+  implementation 'org.apache.logging.log4j:log4j-core:2.9.1'
 
   // 1.60 effectively means jruby-openssl >= 0.10.2 (logstash > 6.7)
   compileOnly group: 'org.bouncycastle', name: 'bcpkix-jdk15on', version: "1.60"

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.4-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.2-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists