Update taiki-e/install-action digest to 6ee6c3a (#4664)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [taiki-e/install-action](https://togithub.com/taiki-e/install-action)
| action | digest | [`d140130` ->
`6ee6c3a`](https://togithub.com/taiki-e/install-action/compare/d140130...6ee6c3a)
|

---

### Configuration

📅 **Schedule**: Branch creation - "after 8pm,before 6am" in timezone
America/Los_Angeles, Automerge - "after 8pm,before 6am" in timezone
America/Los_Angeles.

🚦 **Automerge**: Enabled.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

This PR has been generated by [Renovate
Bot](https://togithub.com/renovatebot/renovate).

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Co-authored-by: oxide-renovate[bot] <146848827+oxide-renovate[bot]@users.noreply.github.com>

.github/workflows/hakari.yml

@@ -24,7 +24,7 @@ jobs:
         with:
           toolchain: stable
       - name: Install cargo-hakari
-        uses: taiki-e/install-action@d140130aeedb5a946a5769684d32e3a33539f226 # v2
+        uses: taiki-e/install-action@6ee6c3ab83eab434138dfa928d72abc7eae14793 # v2
         with:
           tool: cargo-hakari
       - name: Check workspace-hack Cargo.toml is up-to-date