Bump org.testcontainers:testcontainers from 1.20.3 to 1.20.4 (#434)

Bumps [org.testcontainers:testcontainers](https://github.com/testcontainers/testcontainers-java) from 1.20.3 to 1.20.4.
- [Release notes](https://github.com/testcontainers/testcontainers-java/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-java/blob/main/CHANGELOG.md)
- [Commits](testcontainers/testcontainers-java@1.20.3...1.20.4)

---
updated-dependencies:
- dependency-name: org.testcontainers:testcontainers
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -53,7 +53,7 @@ slf4j-nop = "org.slf4j:slf4j-nop:1.7.32"
 spring-boot-starter = { module = "org.springframework.boot:spring-boot-starter", version.ref = "spring-boot" }
 spring-boot-starter-json = { module = "org.springframework.boot:spring-boot-starter-json", version.ref = "spring-boot" }
 spring-boot-starter-test = { module = "org.springframework.boot:spring-boot-starter-test", version.ref = "spring-boot" }
-testcontainers = "org.testcontainers:testcontainers:1.20.3"
+testcontainers = "org.testcontainers:testcontainers:1.20.4"
 
 [plugins]
 dependency-license-report = "com.github.jk1.dependency-license-report:2.0"