Bump org.testcontainers:testcontainers from 1.21.1 to 1.21.3 (#318)

Bumps [org.testcontainers:testcontainers](https://github.com/testcontainers/testcontainers-java) from 1.21.1 to 1.21.3.
- [Release notes](https://github.com/testcontainers/testcontainers-java/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-java/blob/main/CHANGELOG.md)
- [Commits](testcontainers/testcontainers-java@1.21.1...1.21.3)

---
updated-dependencies:
- dependency-name: org.testcontainers:testcontainers
  dependency-version: 1.21.3
  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>
Co-authored-by: MartinWheelerMT <[email protected]>

Author: dependabot[bot]

build.gradle

@@ -76,9 +76,9 @@ dependencies {
 		exclude group: 'org.junit.vintage', module: 'junit-vintage-engine'
 	}
 
-	testImplementation "org.testcontainers:testcontainers:1.21.1"
-	testImplementation group: 'org.awaitility', name: 'awaitility', version: '4.3.0'
-	testImplementation("org.assertj:assertj-core:3.27.3")
+  testImplementation "org.testcontainers:testcontainers:1.21.3"
+  testImplementation group: 'org.awaitility', name: 'awaitility', version: '4.3.0'
+  testImplementation("org.assertj:assertj-core:3.27.3")
 }
 
 test {