Mike McQuaid 2bdf3deb6f
Reduce shallow clone usage
GitHub has requested we request our usage of shallow clones. As a
result:

- do default to shallow clones on CI
- do not do --shallow-since when setting up new repositories in
  `brew update`
- do not support shallow clones of homebrew-core at all

We may consider in future unshallowing all clones unconditionally.
2020-10-09 09:57:04 +01:00
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