Update taiki-e/install-action digest to f87f999 (#224)

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@1e1237f7a4f2d8bc638667e95fe2579653d6db09 # v2
+        uses: taiki-e/install-action@f87f9990b09867202953bff9aa0c80e23ee16bb7 # v2
         with:
           tool: cargo-readme
       - name: Run cargo readme