Update taiki-e/install-action digest to a48a502 (#248)

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@2db346588ecc179293df26b2f8dcc61d3b3ecc40 # v2
+        uses: taiki-e/install-action@a48a50298f98c47e46a957ae6f82c44cc4878e42 # v2
         with:
           tool: cargo-readme
       - name: Run cargo readme