Enable Gradle build cache

[Torch3333]

Description

To speed up the build time, this enables the Gradle build cache. Gradle version is also updated to the latest 8.X version.

The CI execution time should also be reduced once the action cache is populated with the Gradle build cache entries.

Related issues and/or PRs

N/A

Changes made

Enable the Gradle build cache and raise Gradle version.

Checklist

The following is a best-effort checklist. If any items in this checklist are not applicable to this PR or are dependent on other, unmerged PRs, please still mark the checkboxes after you have read and understood each item.

• I have commented my code, particularly in hard-to-understand areas.
• I have updated the documentation to reflect the changes.
• I have considered whether similar issues could occur in other products, components, or modules if this PR is for bug fixes.
• Any remaining open issues linked to this PR are documented and up-to-date (Jira, GitHub, etc.).
• Tests (unit, integration, etc.) have been added for the changes.
• My changes generate no new warnings.
• Any dependent changes in other PRs have been merged and published.

Additional notes (optional)

N/A

Release notes

N/A

[brfrn169]

LGTM! Thank you!

[komamitsu]

LGTM! 👍

[feeblefakie]

LGTM! Thank you!