chore(deps): bump taiki-e/install-action from 2.82.2 to 2.84.0

Bumps [taiki-e/install-action](https://github.com/taiki-e/install-action) from 2.82.2 to 2.84.0.
- [Release notes](https://github.com/taiki-e/install-action/releases)
- [Changelog](https://github.com/taiki-e/install-action/blob/main/CHANGELOG.md)
- [Commits](taiki-e/install-action@9e1e580...a6b2e2d)

---
updated-dependencies:
- dependency-name: taiki-e/install-action
  dependency-version: 2.84.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/test.yml

@@ -95,7 +95,7 @@ jobs:
       - name: Install cargo-llvm-cov
         if: matrix.rust == 'stable'
         # taiki-e/install-action v2.79.7
-        uses: taiki-e/install-action@9e1e5806d4a4822de933115878265be9aaa786d9 # v2.82.2
+        uses: taiki-e/install-action@a6b2e2dcd845ddd7f509ce4f3ed3d922b80cc5d9 # v2.84.0
         with:
           tool: cargo-llvm-cov