[jdk25u] RFR: 8343546: GHA: Cache required dependencies in master-branch workflow

[Aleksey Shipilev]

On Wed, 6 Aug 2025 09:12:25 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Improves GHA reliability and performance.
> 
> Additional testing:
>  - [x] GHA

Push approval granted.

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PR Comment: https://git.openjdk.org/jdk25u/pull/70#issuecomment-3173359560