build(.travis.yml): update node 18 version to LTS

sanjayaksaxena · sanjayaksaxena · commit 29600a2ed791 · 2023-06-30T22:38:16.000+05:30
fails on just "18"
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,6 @@
 language: node_js
 node_js:
-  - "18"
+  - "18.16.1"
   - "16"
 
 cache:
