Bump testContainersVersion from 1.17.5 to 1.17.6 in /Plan (#2726)

Bumps `testContainersVersion` from 1.17.5 to 1.17.6.

Updates `testcontainers` from 1.17.5 to 1.17.6
- [Release notes](https://github.com/testcontainers/testcontainers-java/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-java/blob/main/CHANGELOG.md)
- [Commits](https://github.com/testcontainers/testcontainers-java/compare/1.17.5...1.17.6)

Updates `junit-jupiter` from 1.17.5 to 1.17.6
- [Release notes](https://github.com/testcontainers/testcontainers-java/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-java/blob/main/CHANGELOG.md)
- [Commits](https://github.com/testcontainers/testcontainers-java/compare/1.17.5...1.17.6)

Updates `nginx` from 1.17.5 to 1.17.6
- [Release notes](https://github.com/testcontainers/testcontainers-java/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-java/blob/main/CHANGELOG.md)
- [Commits](https://github.com/testcontainers/testcontainers-java/compare/1.17.5...1.17.6)

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

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Plan/build.gradle

@@ -102,7 +102,7 @@ subprojects {
 
         junitVersion = "5.9.1"
         mockitoVersion = "4.9.0"
-        testContainersVersion = "1.17.5"
+        testContainersVersion = "1.17.6"
         swaggerVersion = "2.2.7"
     }