Update taiki-e/install-action digest to dccf3df (#216)

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@ada1a57be87ab19feb601af3b3e0d2d31972f057 # v2
+        uses: taiki-e/install-action@dccf3df6e0d23d1cceb188bbc2255dd0799bcf48 # v2
         with:
           tool: cargo-readme
       - name: Run cargo readme