github/workflows: use npm install for release testing

Change-Id: I9967b4024c34db71b8ea7d753da4790a4bec9fa7
GitHub-Last-Rev: 8678cf28d1055e546c5ea310e7efda6624441ae2
GitHub-Pull-Request: golang/vscode-go#15
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/224139
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 809a829..eff44f1 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -34,7 +34,7 @@
          go-version: '1.14'
 
       - name: Install dependencies
-        run: npm ci
+        run: npm install
 
       - name: Install Go tools (Modules mode)
         run: |