Update taiki-e/install-action digest to 710817a (#450)

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@887bc4e03483810873d617344dd5189cd82e7b8b # v2
+        uses: taiki-e/install-action@710817a1645ef40daad5bcde7431ceccf6cc3528 # v2
         with:
           tool: cargo-readme
       - name: Run cargo readme