Update dependency org.testcontainers:testcontainers-bom to v1.20.4 (#115)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

pom.xml

@@ -19,7 +19,7 @@
         <sonar.projectKey>piomin_sample-spring-boot-on-kubernetes</sonar.projectKey>
         <sonar.organization>piomin</sonar.organization>
         <sonar.host.url>https://sonarcloud.io</sonar.host.url>
-        <testcontainers.version>1.20.3</testcontainers.version>
+        <testcontainers.version>1.20.4</testcontainers.version>
     </properties>
 
     <dependencies>