Update dependency org.testcontainers:testcontainers to v1.21.1

Author: xdev-renovate

testcontainers-advanced-imagebuilder/pom.xml

@@ -56,7 +56,7 @@
 		<dependency>
 			<groupId>org.testcontainers</groupId>
 			<artifactId>testcontainers</artifactId>
-			<version>1.21.0</version>
+			<version>1.21.1</version>
 			<exclusions>
 				<!-- No JUnit 4 -->
 				<exclusion>