Update dependency org.testcontainers:testcontainers-bom to v1.20.4 (#6)

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

Author: renovate[bot]

gradle/libs.versions.toml

@@ -11,7 +11,7 @@ mockk = "1.13.13"
 reactorTest = "3.7.1"
 springBoot = "3.2.4"
 springMockk = "4.0.2"
-testcontainers = "1.19.7"
+testcontainers = "1.20.4"
 wiremock = "3.5.3"
 
 [libraries]