Chore: bump tests to node v18 (to allow use of WebCrypto)

Author: coolaj86

.github/workflows/test_and_release.yml

@@ -20,7 +20,7 @@ jobs:
 
       - uses: actions/setup-node@v2
         with:
-          node-version: '12'
+          node-version: '18'
 
       - name: Enable NPM cache
         uses: actions/cache@v2