Fix CI caching

[PatrickDeVries]

c-hive/gha-yarn-cache@v2 is deprecated and subsumed by setup-node but we are currently using both

[dawsonbooth]

Related links:

• https://github.com/c-hive/gha-yarn-cache#deprecated
• https://github.com/actions/setup-node/blob/main/docs/advanced-usage.md#caching-packages-data
• https://github.com/actions/cache/blob/main/examples.md#node---yarn-2