Update taiki-e/install-action digest to 7bf3bbf (#270)

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@735e5933943122c5ac182670a935f54a949265c1 # v2
+        uses: taiki-e/install-action@7bf3bbf3104a2e9a77906ccbdf6d4aa6a87b0210 # v2
         with:
           tool: cargo-readme
       - name: Run cargo readme