ci: Update GitHub Actions workflows to use Node.js 22.x

Author: exaby73

.github/workflows/integration-tests.yml

@@ -12,7 +12,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [18.x] # Using only Node.js LTS for integration tests
+        node-version: [22.x]
 
     steps:
       - uses: actions/checkout@v4

.github/workflows/unit-tests.yml

@@ -12,7 +12,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [16.x, 18.x, 20.x]
+        node-version: [22.x]
 
     steps:
       - uses: actions/checkout@v4