Update taiki-e/install-action digest to ebb229c (#376)

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@2cdf2d81f4edfc3b41d5ddf56083c70b48ac2475 # v2
+        uses: taiki-e/install-action@ebb229c6baa68383264f2822689b07b4916d9177 # v2
         with:
           tool: cargo-readme
       - name: Run cargo readme