Update taiki-e/install-action digest to 7afac3d (#204)

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@54b836426b3fa9aef432e760885ea0419ab50dab # v2
+        uses: taiki-e/install-action@7afac3d3beca852dc6b16b0a27ca2511270e3dc5 # v2
         with:
           tool: cargo-readme
       - name: Run cargo readme