Update the Java JDK version and Helm in integration image builds
The previous JDK version is now failing to install; I believe it's been deprecated due to security issues.
By virtue of invoking get-helm-3 script, this also updates Helm to 3.1.
Test Plan: buildkite
Reviewers: max, alangenfeld
Reviewed By: alangenfeld
Differential Revision: https://dagster.phacility.com/D2049