Update taiki-e/install-action digest to ab3728c (#254)

Author: nextest-bot

.github/workflows/ci.yml

@@ -25,7 +25,7 @@ jobs:
       - name: Lint (rustfmt)
         run: cargo xfmt --check
       - name: Install cargo readme
-        uses: taiki-e/install-action@067268f3aa4f1f3c2becf69d7454955cfab17334 # v2
+        uses: taiki-e/install-action@ab3728c7ba6948b9b429627f4d55a68842b27f18 # v2
         with:
           tool: cargo-readme
       - name: Run cargo readme