Bump taiki-e/install-action from 2.18.9 to 2.21.2

Bumps [taiki-e/install-action](https://github.com/taiki-e/install-action) from 2.18.9 to 2.21.2.
- [Release notes](https://github.com/taiki-e/install-action/releases)
- [Changelog](https://github.com/taiki-e/install-action/blob/main/CHANGELOG.md)
- [Commits](https://github.com/taiki-e/install-action/compare/v2.18.9...v2.21.2)

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

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

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

@@ -56,7 +56,7 @@ jobs:
         with:
           toolchain: ${{ matrix.version }}
 
-      - uses: taiki-e/install-action@v2.20.14
+      - uses: taiki-e/install-action@v2.21.2
         with:
           tool: cargo-hack
 
@@ -116,7 +116,7 @@ jobs:
           toolchain: nightly
 
       - name: Install cargo-hack & cargo-minimal-versions
-        uses: taiki-e/install-action@v2.20.14
+        uses: taiki-e/install-action@v2.21.2
         with:
           tool: cargo-hack,cargo-minimal-versions
 
@@ -133,7 +133,7 @@ jobs:
         uses: actions-rust-lang/setup-rust-toolchain@v1.5.0
 
       - name: Install cargo-nextest
-        uses: taiki-e/install-action@v2.20.14
+        uses: taiki-e/install-action@v2.21.2
         with:
           tool: cargo-nextest
 

.github/workflows/ci.yml

@@ -57,7 +57,7 @@ jobs:
         with:
           toolchain: ${{ matrix.version }}
 
-      - uses: taiki-e/install-action@v2.20.14
+      - uses: taiki-e/install-action@v2.21.2
         with:
           tool: cargo-hack
 

.github/workflows/coverage.yml

@@ -23,7 +23,7 @@ jobs:
           components: llvm-tools-preview
 
       - name: Install cargo-llvm-cov
-        uses: taiki-e/install-action@v2.18.9
+        uses: taiki-e/install-action@v2.21.2
         with:
           tool: cargo-llvm-cov