Update taiki-e/install-action digest to efd8b64 (#353)

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@00a367b59ffa7299659baf1168279aefe69f5516 # v2
+        uses: taiki-e/install-action@efd8b64311f7a0a9b888ed13d0df78ec9184c163 # v2
         with:
           tool: cargo-readme
       - name: Run cargo readme