Bump taiki-e/install-action from 2.68.8 to 2.68.16

Bumps [taiki-e/install-action](https://github.com/taiki-e/install-action) from 2.68.8 to 2.68.16.
- [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@cfdb446...d6e286f)

---
updated-dependencies:
- dependency-name: taiki-e/install-action
  dependency-version: 2.68.16
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

.github/workflows/checks.yaml

@@ -90,7 +90,7 @@ jobs:
         run: "rustc -vV | sed -n 's|host: ||p'"
         if: matrix.os != 'windows-2022'
       - name: Install cargo-llvm-cov & cargo-nextest
-        uses: taiki-e/install-action@cfdb446e391c69574ebc316dfb7d7849ec12b940 # v2.68.8
+        uses: taiki-e/install-action@d6e286fa45544157a02d45a43742857ebbc25d12 # v2.68.16
         with:
           tool: cargo-llvm-cov,cargo-nextest
       - name: Cache apt packages
@@ -236,7 +236,7 @@ jobs:
           rustup toolchain install nightly --component miri
           cargo +nightly miri setup
       - name: Install cargo-nextest
-        uses: taiki-e/install-action@cfdb446e391c69574ebc316dfb7d7849ec12b940 # v2.68.8
+        uses: taiki-e/install-action@d6e286fa45544157a02d45a43742857ebbc25d12 # v2.68.16
         with:
           tool: cargo-nextest
       - name: Run unit tests with miri