Bump taiki-e/install-action in the github-actions group

Bumps the github-actions group with 1 update: [taiki-e/install-action](https://github.com/taiki-e/install-action).


Updates `taiki-e/install-action` from 2.86.7 to 2.86.8
- [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@b6ff580...fcf5432)

---
updated-dependencies:
- dependency-name: taiki-e/install-action
  dependency-version: 2.86.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: github-actions
...

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

Author: dependabot[bot]

.github/workflows/build.yaml

@@ -73,7 +73,7 @@ jobs:
       # These are the prebuilt binaries; the Makefile skips its own install when
       # they are already on PATH.
       - name: Install cargo tools
-        uses: taiki-e/install-action@b6ff580856c41316412a0b9b60540fbc6f8c82cc  # v2.86.7
+        uses: taiki-e/install-action@fcf5432d9f50d67e37ee6e29bdb7a224ff67b4a7  # v2.86.8
         with:
           tool: cargo-nextest,cargo-llvm-cov