fix(deps): update testcontainers-java monorepo to v1.21.4 (#95)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Thor Tudal Lauridsen <30320530+thorlauridsen@users.noreply.github.com>

Author: renovate[bot]

gradle/local.versions.toml

@@ -6,7 +6,7 @@ postgres = "42.7.8"
 springboot = "4.0.0"
 springDependencyPlugin = "1.1.7"
 springdoc = "3.0.0"
-testcontainers = "1.21.3"
+testcontainers = "1.21.4"
 
 [libraries]
 # H2 for an in-memory database