chore(deps): update taiki-e/install-action digest to 6f9c7cc (#519)

Author: nextest-bot

.github/workflows/ci.yml

@@ -26,7 +26,7 @@ jobs:
       - name: Lint (rustfmt)
         run: cargo xfmt --check
       - name: Install cargo readme
-        uses: taiki-e/install-action@f535147c22906d77695e11cb199e764aa610a4fc # v2
+        uses: taiki-e/install-action@6f9c7cc51aa54b13cbcbd12f8bbf69d8ba405b4b # v2
         with:
           tool: cargo-readme
       - name: Run cargo readme

.github/workflows/release.yml

@@ -17,7 +17,7 @@ jobs:
       - name: Install Rust
         uses: dtolnay/rust-toolchain@stable
       - name: Install cargo release
-        uses: taiki-e/install-action@f535147c22906d77695e11cb199e764aa610a4fc # v2
+        uses: taiki-e/install-action@6f9c7cc51aa54b13cbcbd12f8bbf69d8ba405b4b # v2
         with:
           tool: cargo-release@0.25.0
       - uses: taiki-e/create-gh-release-action@26b80501670402f1999aff4b934e1574ef2d3705 # v1