Update taiki-e/install-action digest to 5a16857

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@1b95e9e5c188cd8150acc206bfa46e49c4a84785 # v2
+        uses: taiki-e/install-action@5a168576eaffe28a939e2b765e9cbea2d65f3f70 # v2
         with:
           tool: cargo-readme
       - name: Run cargo readme