Fix dependency management for Byte Buddy

 - Manage byte-buddy-agent in addition to byte-buddy
 - Remove dependency management from spring-boot-parent now that
   dependency management for Byte Buddy is provided in
   spring-boot-dependencies

Closes gh-9373

spring-boot-dependencies/pom.xml

@@ -959,6 +959,11 @@
 				<artifactId>byte-buddy</artifactId>
 				<version>${byte-buddy.version}</version>
 			</dependency>
+			<dependency>
+				<groupId>net.bytebuddy</groupId>
+				<artifactId>byte-buddy-agent</artifactId>
+				<version>${byte-buddy.version}</version>
+			</dependency>
 			<dependency>
 				<groupId>net.java.dev.jna</groupId>
 				<artifactId>jna</artifactId>

spring-boot-parent/pom.xml

@@ -80,11 +80,6 @@
 				<artifactId>jline</artifactId>
 				<version>2.11</version>
 			</dependency>
-			<dependency>
-				<groupId>net.bytebuddy</groupId>
-				<artifactId>byte-buddy</artifactId>
-				<version>1.6.0</version>
-			</dependency>
 			<dependency>
 				<groupId>net.sf.jopt-simple</groupId>
 				<artifactId>jopt-simple</artifactId>