[buddypress-trac] [BuddyPress Trac] #9213: Github Action: Update `actions/cache at v2` to v4

[buddypress-trac]

#9213: Github Action: Update `actions/cache at v2` to v4
------------------------------+-------------------------
 Reporter:  espellcaste       |      Owner:  espellcaste
     Type:  enhancement       |     Status:  assigned
 Priority:  normal            |  Milestone:  15.0.0
Component:  Build/Test Tools  |    Version:
 Severity:  normal            |   Keywords:
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 To avoid this issue:

 > The following actions uses node12 which is deprecated and will be forced
 to run on node16: actions/cache at v2. For more info:
 https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-
 run-on-node16-instead-of-node12-by-default/

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Ticket URL: <https://buddypress.trac.wordpress.org/ticket/9213>
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