chore: bump up taiki-e/install-action digest to 8702668

Author: renovate[bot]

.github/workflows/CI.yml

@@ -116,7 +116,7 @@ jobs:
         with:
           version: 0.14.1
       - name: Install cargo-zigbuild
-        uses: taiki-e/install-action@3f67faa728964808f52294a9cd15561b15550b28 # v2
+        uses: taiki-e/install-action@870266878ed54ea9ceb25502c53e42aa939585a6 # v2
         if: ${{ contains(matrix.settings.target, 'musl') }}
         env:
           GITHUB_TOKEN: ${{ github.token }}