chore: use node v14 for shipjs actions

Author: nd0ut

.github/workflows/shipjs-manual-prepare.yml

@@ -14,7 +14,9 @@ jobs:
         with:
           fetch-depth: 0
           ref: main
-      - uses: actions/setup-node@v1
+      - uses: actions/setup-node@v2
+        with:
+          node-version: '14'
       - run: |
           if [ -f "yarn.lock" ]; then
             yarn install

.github/workflows/shipjs-trigger.yml

@@ -13,8 +13,9 @@ jobs:
         with:
           fetch-depth: 0
           ref: main
-      - uses: actions/setup-node@v1
+      - uses: actions/setup-node@v2
         with:
+          node-version: '14'
           registry-url: "https://registry.npmjs.org"
       - run: |
           if [ -f "yarn.lock" ]; then