Update taiki-e/install-action digest to 0551545

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@5ffe29a8b19894ab68b6dc6f8d07142b719c3735 # v2
+        uses: taiki-e/install-action@05515455a9007c7c6f0b215637566ab8e9872c12 # v2
         with:
           tool: cargo-readme
       - name: Run cargo readme