Fetch redpanda directly from docker hub

Attempt to avoid rate limiting issues by fetching redpanda directly
from docker hub.

See gh-34780

spring-boot-project/spring-boot-tools/spring-boot-test-support/src/main/java/org/springframework/boot/testsupport/testcontainers/DockerImageNames.java

@@ -145,7 +145,7 @@ public final class DockerImageNames {
 	 * @return a docker image name for running redpanda
 	 */
 	public static DockerImageName redpanda() {
-		return DockerImageName.parse("docker.redpanda.com/redpandadata/redpanda").withTag(REDPANDA_VERSION);
+		return DockerImageName.parse("redpandadata/redpanda").withTag(REDPANDA_VERSION);
 	}
 
 	/**