Update build.gradle to use isSnapshot logic

[khushbr]

Is your feature request related to a problem? Please provide an existing Issue # , or describe.
Addresses build failure seen for 2.11.1: https://github.com/opensearch-project/performance-analyzer-rca/actions/runs/6899471514/job/18771262101#step:11:33

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Execution failed for task ':updateShas'.
> Could not resolve all dependencies for configuration ':runtimeClasspath'.
   > Conflict(s) found for the following module(s):
       - org.apache.logging.log4j:log4j-api between versions 2.21.0 and 2.20.0
       - org.apache.logging.log4j:log4j-core between versions 2.21.0 and 2.20.0
     Run with:
         --scan or
         :dependencyInsight --configuration runtimeClasspath --dependency org.apache.logging.log4j:log4j-api
     to get more insight on how to solve the conflict.

Check List

• Backport Labels added.
• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b86f6e3) 75.74% compared to head (ca48146) 75.67%.

❗ Current head ca48146 differs from pull request most recent head 8d36b95. Consider uploading reports for the commit 8d36b95 to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##               2.11     #521      +/-   ##
============================================
- Coverage     75.74%   75.67%   -0.08%     
+ Complexity     2584     2581       -3     
============================================
  Files           303      303              
  Lines         15415    15415              
  Branches       1218     1218              
============================================
- Hits          11676    11665      -11     
- Misses         3250     3260      +10     
- Partials        489      490       +1     

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