Avoid using Jackson 2.15 in system tests that invoke Gradle

Closes gh-35273

spring-boot-system-tests/spring-boot-image-tests/build.gradle

@@ -11,6 +11,17 @@ configurations {
 	providedRuntime {
 		extendsFrom dependencyManagement
 	}
+	all {
+		resolutionStrategy {
+			eachDependency { dependency ->
+				// Downgrade Jackson as Gradle cannot cope with 2.15.0's multi-version
+				// jar files with bytecode in META-INF/versions/19
+				if (dependency.requested.group.startsWith("com.fasterxml.jackson")) {
+					dependency.useVersion("2.14.2")
+				}
+			}
+		}
+	}
 }
 
 task syncMavenRepository(type: Sync) {