build: update node engine requirement to v20

Update CI workflows to use node v20 to match the new engine requirement in package.json

Author: Hugo Perez

.github/workflows/coverage.yml

@@ -16,7 +16,7 @@ jobs:
 
       - uses: actions/setup-node@v4
         with:
-          node-version: '18'
+          node-version: '20'
 
       - name: Install dependencies
         run: npm install

.github/workflows/release.yml

@@ -15,7 +15,7 @@ jobs:
 
       - uses: actions/setup-node@v4
         with:
-          node-version: '18'
+          node-version: '20'
 
       - name: Install dependencies
         run: npm install

package.json

@@ -65,7 +65,7 @@
     "url": "https://github.com/SOVEREIGN-NET/Sovereign-Network-API-Client/issues"
   },
   "engines": {
-    "node": ">=18.0.0"
+    "node": ">=20.0.0"
   },
   "devDependencies": {
     "@semantic-release/changelog": "^6.0.3",