Update dependency earthly/earthly to v0.8.8

[renovate]

This PR contains the following updates:

Package	Update	Change
earthly/earthly	patch	v0.8.7 -> v0.8.8

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Release Notes

earthly/earthly (earthly/earthly)

v0.8.8

Compare Source

Added

• New experimental wildcard-based copy, e.g. COPY ./services/*+artifact/* . which would invoke COPY for ./services/foo+artifact, and ./services/bar+artifact (assuming two services foo and bar, both having a artifact target in their respective Earthfile). Enable with the VERSION --wildcard-copy feature flag. #​3966.
• New built-in ARGs - EARTHLY_GIT_AUTHOR_EMAIL and EARTHLY_GIT_AUTHOR_NAME will contain the author email and author name respectively. Enable with the VERSION --git-author-email-name-args feature flag.
• New --raw-output flag available on RUN that outputs line without target name. Enable with VERSION --raw-output. #​3713

Changed

• EARTHLY_GIT_AUTHOR built-in ARG will now contain both name and email, when enabled with the VERSION --git-author-email-name-args feature flag. Previously it only contained the email. #​3822

Fixed

• Make LET/SET commands block parallel commands such as BUILD until the former are processed, similar to the behavior of ARG. #​3997
• LET/SET commands were not properly handled with the use of Auto-skip. #​3996

Additional Info

• This release has no changes to buildkit

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