minor fixes for node20 (#22894)

azure-pipelines.yml

@@ -73,8 +73,8 @@ jobs:
 
     - task: NodeTool@0
       inputs:
-        versionSpec: '16.x'
-      displayName: 'Install node.js 16.x'
+        versionSpec: '20.x'
+      displayName: 'Install node.js 20.x'
       condition: and(succeeded(), eq(variables['skipci'], 'false'))
 
     - bash: |

tests/js/tnativeexc.nim

@@ -18,7 +18,7 @@ try:
 except JsEvalError:
   doAssert false
 except JsSyntaxError as se:
-  doAssert se.message == "Unexpected token ; in JSON at position 0"
+  doAssert se.message == "Unexpected token ';', \";;\" is not valid JSON"
 except JsError as e:
   doAssert false