Update dependency earthly/earthly to v0.8.8 (#37)

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This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [earthly/earthly](https://togithub.com/earthly/earthly) | patch |
`v0.8.7` -> `v0.8.8` |

---

### Release Notes

<details>
<summary>earthly/earthly (earthly/earthly)</summary>

###
[`v0.8.8`](https://togithub.com/earthly/earthly/blob/HEAD/CHANGELOG.md#v088---2024-04-17)

[Compare
Source](https://togithub.com/earthly/earthly/compare/v0.8.7...v0.8.8)

##### 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. [#&#8203;3966](https://togithub.com/earthly/earthly/issues/3966).
- New built-in `ARG`s - `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`.
[#&#8203;3713](https://togithub.com/earthly/earthly/issues/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.
[#&#8203;3822](https://togithub.com/earthly/earthly/issues/3822)

##### Fixed

- Make `LET`/`SET` commands block parallel commands such as `BUILD`
until the former are processed, similar to the behavior of `ARG`.
[#&#8203;3997](https://togithub.com/earthly/earthly/issues/3997)
- `LET`/`SET` commands were not properly handled with the use of
Auto-skip.
[#&#8203;3996](https://togithub.com/earthly/earthly/issues/3996)

##### Additional Info

-   This release has no changes to buildkit

</details>

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---

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.github/workflows/ci.yml

@@ -23,7 +23,7 @@ jobs:
     steps:
       - uses: earthly/actions/setup-earthly@v1
         with:
-          version: v0.8.7
+          version: v0.8.8
       - uses: actions/checkout@v4
       - name: Docker login (non fork only)
         run: |-

.github/workflows/release.yml

@@ -17,7 +17,7 @@ jobs:
     steps:
       - uses: earthly/actions/setup-earthly@v1
         with:
-          version: v0.8.7
+          version: v0.8.8
       - uses: actions/checkout@v4
       - name: Docker login (non fork only)
         run: |-