ci(deps): update taiki-e/install-action action to v2.21.20 (#457)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [taiki-e/install-action](https://togithub.com/taiki-e/install-action)
| action | patch | `v2.21.19` -> `v2.21.20` |

---

### Release Notes

<details>
<summary>taiki-e/install-action (taiki-e/install-action)</summary>

###
[`v2.21.20`](https://togithub.com/taiki-e/install-action/releases/tag/v2.21.20):
2.21.20

[Compare
Source](https://togithub.com/taiki-e/install-action/compare/v2.21.19...v2.21.20)

-   Update `grcov@latest` to 0.8.19.

</details>

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined),
Automerge - At any time (no schedule defined).

🚦 **Automerge**: Enabled.

♻ **Rebasing**: Whenever PR is behind base branch, or you tick the
rebase/retry checkbox.

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

---

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.github/workflows/build.yml

@@ -63,7 +63,7 @@ jobs:
           key: ${{ matrix.target }}
       - name: Install cross
         if: ${{ !matrix.os && matrix.use-cross }}
-        uses: taiki-e/install-action@b61491983a082ef851796e8c4feac004b49da5be # v2.21.19
+        uses: taiki-e/install-action@addb7d697b0081ef0a2b09d830daf6269d640920 # v2.21.20
         with:
           tool: cross
       - run: ${{ (!matrix.os && matrix.use-cross) && 'cross' || 'cargo' }} build --locked --release --target ${{ matrix.target }}