Update taiki-e/install-action digest to 4b40a97 (#6969)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
|
[taiki-e/install-action](https://redirect.github.com/taiki-e/install-action)
| action | digest | [`939f4af` ->
`4b40a97`](https://redirect.github.com/taiki-e/install-action/compare/939f4af...4b40a97)
|

---

### 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

---

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.github/workflows/hakari.yml

@@ -23,7 +23,7 @@ jobs:
         with:
           toolchain: stable
       - name: Install cargo-hakari
-        uses: taiki-e/install-action@939f4af9602e15ef93b3329722569cb907a004ff # v2
+        uses: taiki-e/install-action@4b40a9728e3c110fabe8850443d8bbe69daddb22 # v2
         with:
           tool: cargo-hakari
       - name: Check workspace-hack Cargo.toml is up-to-date