revert/use fixed Node version in CI

Author: mvorisek

.github/workflows/nightly.yml

@@ -18,6 +18,7 @@ jobs:
         ref: develop
     - uses: actions/setup-node@v3
       with:
+        node-version: 18
         registry-url: https://registry.npmjs.org/
     - name: pre-setup
       run: sh ./scripts/preinstall.sh

.github/workflows/release.yml

@@ -16,6 +16,7 @@ jobs:
         ref: master
     - uses: actions/setup-node@v3
       with:
+        node-version: 18
         registry-url: https://registry.npmjs.org/
     - name: pre-setup
       run: sh ./scripts/preinstall.sh