Bump taiki-e/install-action from 2.20.15 to 2.21.3 (#360)

Bumps [taiki-e/install-action](https://github.com/taiki-e/install-action) from 2.20.15 to 2.21.3.
- [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@v2.20.15...v2.21.3)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/ci-post-merge.yml

@@ -35,7 +35,7 @@ jobs:
         with:
           toolchain: nightly
 
-      - uses: taiki-e/install-action@v2.20.15
+      - uses: taiki-e/install-action@v2.21.3
         with:
           tool: cargo-hack
 
@@ -77,7 +77,7 @@ jobs:
         with:
           toolchain: nightly
 
-      - uses: taiki-e/install-action@v2.20.15
+      - uses: taiki-e/install-action@v2.21.3
         with:
           tool: cargo-hack
 

.github/workflows/ci.yml

@@ -49,7 +49,7 @@ jobs:
           toolchain: ${{ matrix.version.version }}
 
       - name: Install cargo-hack
-        uses: taiki-e/install-action@v2.20.15
+        uses: taiki-e/install-action@v2.21.3
         with:
           tool: cargo-hack
 
@@ -100,7 +100,7 @@ jobs:
           toolchain: ${{ matrix.version.version }}
 
       - name: Install cargo-hack
-        uses: taiki-e/install-action@v2.20.15
+        uses: taiki-e/install-action@v2.21.3
         with:
           tool: cargo-hack