Bump version.testcontainers from 1.19.8 to 1.20.0

Bumps `version.testcontainers` from 1.19.8 to 1.20.0.

Updates `org.testcontainers:db2` from 1.19.8 to 1.20.0
- [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...1.20.0)

Updates `org.testcontainers:oracle-xe` from 1.19.8 to 1.20.0
- [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...1.20.0)

Updates `org.testcontainers:postgresql` from 1.19.8 to 1.20.0
- [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...1.20.0)

---
updated-dependencies:
- dependency-name: org.testcontainers:db2
  dependency-type: direct:development
  update-type: version-update:semver-minor
- dependency-name: org.testcontainers:oracle-xe
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.testcontainers:postgresql
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

pom.xml

@@ -89,7 +89,7 @@
     <version.jacoco>0.8.12</version.jacoco>
     <version.slf4j-test>3.0.1</version.slf4j-test>
     <version.auto-restdocs>2.0.11</version.auto-restdocs>
-    <version.testcontainers>1.19.8</version.testcontainers>
+    <version.testcontainers>1.20.0</version.testcontainers>
 
     <!-- AspectJ dependencies -->
     <version.aspectj-maven-plugin>1.15.0</version.aspectj-maven-plugin>