build(ci): re-enable gradle build cache

[david-allison]

Purpose / Description

We disabled the gradle cache due to corruption bugs:

• 6768519
• 5ad2157

The underlying bug was closed and we're on Gradle 8.7:

---

I'm going to close this issue now that Gradle 8.7 has been released with a fix.
Please let us know if you continue to experience this problem with Gradle 8.7.

https://redirect.github.com/gradle/actions/issues/47#issuecomment-2030308363

gradle-wrapper.properties shows distributionUrl=https\://services.gradle.org/distributions/gradle-8.7-bin.zip

Approach

Revert the above two commits

How Has This Been Tested?

YOLO (CI only)

Learning (optional, can help others)

• See discussion on Immutable workspace contents have been modified with current gradle (8.6) and this action gradle/actions#47 (comment)

Checklist

• You have a descriptive commit message with a short title (first line, max 50 chars).
• You have commented your code, particularly in hard-to-understand areas
• You have performed a self-review of your own code
• UI changes: include screenshots of all affected screens (in particular showing any new or changed strings)
• UI Changes: You have tested your change using the Google Accessibility Scanner

[mikehardy]

This is great! Read through the related PRs, thanks for posting up useful info to them, that was a loose end I really wanted to pursue as it seemed like a serious upstream issue. I'm following the one they left open to get a real fix for gradle 8.8