Fixed checker-qual issue

buildSrc/src/main/groovy/org/apache/beam/gradle/BeamModulePlugin.groovy

@@ -21,27 +21,22 @@ package org.apache.beam.gradle
 import com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar
 import groovy.json.JsonOutput
 import groovy.json.JsonSlurper
-import org.gradle.api.attributes.Category
 import org.gradle.api.GradleException
 import org.gradle.api.Plugin
 import org.gradle.api.Project
 import org.gradle.api.Task
 import org.gradle.api.artifacts.Configuration
 import org.gradle.api.artifacts.ProjectDependency
+import org.gradle.api.attributes.Category
 import org.gradle.api.file.FileCollection
 import org.gradle.api.file.FileTree
 import org.gradle.api.plugins.quality.Checkstyle
 import org.gradle.api.publish.maven.MavenPublication
-import org.gradle.api.tasks.Copy
-import org.gradle.api.tasks.Delete
-import org.gradle.api.tasks.Exec
-import org.gradle.api.tasks.JavaExec
+import org.gradle.api.tasks.*
 import org.gradle.api.tasks.bundling.Jar
 import org.gradle.api.tasks.compile.JavaCompile
 import org.gradle.api.tasks.javadoc.Javadoc
 import org.gradle.api.tasks.testing.Test
-import org.gradle.api.tasks.PathSensitive
-import org.gradle.api.tasks.PathSensitivity
 import org.gradle.testing.jacoco.tasks.JacocoReport
 
 import java.util.concurrent.atomic.AtomicInteger
@@ -858,7 +853,6 @@ class BeamModulePlugin implements Plugin<Project> {
         "com.google.auto.value:auto-value-annotations:1.7.2",
         "com.google.auto.service:auto-service-annotations:1.0-rc6",
         "com.google.j2objc:j2objc-annotations:1.3",
-        "org.checkerframework:checker-qual:3.7.0",
         "com.google.code.findbugs:jsr305:3.0.2",
         // These dependencies are needed to avoid error-prone warnings on package-info.java files,
         // also to include the annotations to suppress warnings.
@@ -996,6 +990,7 @@ class BeamModulePlugin implements Plugin<Project> {
           permitUnusedDeclared dep
           permitTestUnusedDeclared dep
         }
+        permitUnusedDeclared "org.checkerframework:checker-qual:$checkerframework_version"
       }
       if (configuration.enableStrictDependencies) {
         project.tasks.analyzeClassesDependencies.enabled = true