immutable is default in CI

Author: cometkim

.github/workflows/ci.yml

@@ -254,7 +254,7 @@ jobs:
         run: opam exec -- dune build --display quiet --profile static
 
       - name: Install npm packages
-        run: yarn install --immutable
+        run: yarn install
 
       - name: Copy compiler exes to platform bin dir
         run: node ./scripts/copyExes.js -compiler
@@ -406,7 +406,7 @@ jobs:
           node-version-file: .nvmrc
 
       - name: NPM install
-        run: yarn install --immutable
+        run: yarn install
 
       - name: Download artifacts
         uses: actions/download-artifact@v4