Update taiki-e/install-action digest to 81ecf98 (#382)

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@a24ba45235ed716ff76646268742990dc9458860 # v2
+        uses: taiki-e/install-action@81ecf985428d5c2ea81dbf079bceca32bc9604ab # v2
         with:
           tool: cargo-readme
       - name: Run cargo readme