Fix build after checkstyle imports updates

See gh-14911

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/main/java/org/springframework/boot/gradle/plugin/UnresolvedDependenciesAnalyzer.java

@@ -17,14 +17,14 @@
 package org.springframework.boot.gradle.plugin;
 
 import java.util.HashSet;
-import java.util.Set;
 import java.util.stream.Collectors;
 
 import io.spring.gradle.dependencymanagement.DependencyManagementPlugin;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
 import org.gradle.api.Project;
 import org.gradle.api.artifacts.ModuleVersionSelector;
 import org.gradle.api.artifacts.UnresolvedDependency;
-import org.slf4j.LoggerFactory;
 
 /**
  * An analyzer for {@link UnresolvedDependency unresolvable dependencies} that logs a
@@ -35,8 +35,7 @@ import org.slf4j.LoggerFactory;
  */
 class UnresolvedDependenciesAnalyzer {
 
-	private static final org.slf4j.Logger logger = LoggerFactory
-			.getLogger(SpringBootPlugin.class);
+	private static final Log logger = LogFactory.getLog(SpringBootPlugin.class);
 
 	private Set<ModuleVersionSelector> dependenciesWithNoVersion = new HashSet<>();
 

src/checkstyle/checkstyle-suppressions.xml

@@ -33,4 +33,5 @@
 	<suppress files="SpringBootJoranConfiguratorTests\.java" checks="IllegalImport" />
 	<suppress files="EmbeddedMongoAutoConfiguration\.java" checks="IllegalImport" />
 	<suppress files="LogbackMetricsAutoConfiguration\.java" checks="IllegalImport" />
+	<suppress files="RemoteUrlPropertyExtractorTests\.java" checks="IllegalImport" />
 </suppressions>