Ensure thread safe for attribute currentNode

[prakanth97]

Purpose

$title

Examples

Checklist

• Linked to an issue
• Updated the changelog
• Added tests
• Updated the spec
• Checked native-image compatibility

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (e7a9b64) 74.16% compared to head (3872a93) 74.24%.
Report is 2 commits behind head on main.

Files	Patch %	Lines
...o/ballerina/stdlib/data/xmldata/xml/XmlParser.java	93.47%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main       #4      +/-   ##
============================================
+ Coverage     74.16%   74.24%   +0.08%     
  Complexity      381      381              
============================================
  Files            19       19              
  Lines          1819     1825       +6     
  Branches        420      420              
============================================
+ Hits           1349     1355       +6     
  Misses          370      370              
  Partials        100      100              

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