Cocoapods example should cache the system cache rather than build products

[daveisfera]

For node, it's recommend to not cache node_modules, but the current example for Cocoapods is doing something similar, so it should be changed to cache the system cache rather than the build products

The change would be to set path to:

path: |
  ~/Library/Caches/CocoaPods
  ~/.cocoapods

I believe this would address several existing issues (#401 #455 #1115 #1136)

[github-actions[bot]]

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[daveisfera]

There is a note about this in the examples now, but the Lerna example still caches node_modules