ci: use Node 24 only for CI tests

- Update workflow to test only with Node 24 (current LTS)
- Update .nvmrc to v22 for local development testing
- All integration tests passing on Node 22.22.0

Author: vobu

.github/workflows/test.yml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        node: [22, 24]
+        node: [24]
         camunda: ['8.8', '8.9']
 
     steps:

.nvmrc

@@ -1 +1 @@
-v24
+v22