Update taiki-e/install-action digest to aa4fe33 (#287)

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@2a3397031cc3ea3b5341eab31f073a602ab6d852 # v2
+        uses: taiki-e/install-action@aa4fe33785fb40e67b1b3a8e0d0a3a333e269e32 # v2
         with:
           tool: cargo-readme
       - name: Run cargo readme