Bump test_versions.testcontainers from 1.19.8 to 1.20.1

Bumps `test_versions.testcontainers` from 1.19.8 to 1.20.1.

Updates `org.testcontainers:mongodb` from 1.19.8 to 1.20.1
- [Release notes](https://github.com/testcontainers/testcontainers-java/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-java/blob/main/CHANGELOG.md)
- [Commits](testcontainers/testcontainers-java@1.19.8...1.20.1)

Updates `org.testcontainers:junit-jupiter` from 1.19.8 to 1.20.1
- [Release notes](https://github.com/testcontainers/testcontainers-java/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-java/blob/main/CHANGELOG.md)
- [Commits](testcontainers/testcontainers-java@1.19.8...1.20.1)

---
updated-dependencies:
- dependency-name: org.testcontainers:mongodb
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.testcontainers:junit-jupiter
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

gradle/dependencies.gradle

@@ -31,7 +31,7 @@ ext {
             jsonassert    : '1.5.3',
             rest_assured  : '5.4.0',
             commons_codec : '1.17.1',
-            testcontainers: '1.19.8',
+            testcontainers: '1.20.1',
             mockserver    : '5.15.0',
             awaitility    : '4.2.2'
     ]