Use the new cache service: upgrade @actions/cache to ^4.0.0

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Description:
Following the announcement of the sunsetting of the legacy actions cache service & the deprecation of several versions of the @actions/cache package, this change upgrades setup-go to the latest cache package to prevent cache failures when the sunsetting start.

Related issue:

• Reference announcement in actions/toolkit: @actions/cache Package Deprecation Notice. Upgrade to the latest `4.0.0` or higher before February 1st 2025 toolkit#1890

Check list:

• Mark if documentation changes are required.
• Mark if tests were added or updated to cover the changes.

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For the Code scanning results:

• https://github.com/actions/setup-go/security/code-scanning/16: dist/cache-save/index.js:60133
• https://github.com/actions/setup-go/security/code-scanning/17: dist/setup/index.js:67151

Both of these related to a twirp server implementation which comes part of one our dependencies. Twirp servers are never initialised in the context of this action and the code path is unreachable and unexploitable.

These are false positives that can be safely dismissed.