Fix object getType() API usage

[HindujaB]

Purpose

This is to support the build for ballerina-platform/ballerina-library#4344

Examples

Checklist

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

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (6b1f5ed) 81.12% compared to head (c34285e) 81.12%.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #344   +/-   ##
=========================================
  Coverage     81.12%   81.12%           
  Complexity      107      107           
=========================================
  Files            26       26           
  Lines           694      694           
  Branches         71       71           
=========================================
  Hits            563      563           
  Misses           91       91           
  Partials         40       40           

Impacted Files	Coverage Δ
.../src/main/java/io/ballerina/stdlib/stan/Utils.java	89.47% <100.00%> (ø)
...java/io/ballerina/stdlib/stan/consumer/Attach.java	96.15% <100.00%> (ø)
...lerina/stdlib/stan/consumer/StreamingListener.java	85.18% <100.00%> (ø)
...a/io/ballerina/stdlib/stan/consumer/Subscribe.java	84.94% <100.00%> (ø)

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