[Backport 2.x] Fixes version matcher string in demo config installer

[opensearch-trigger-bot]

Backport 9e36031 from #5157.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.24%. Comparing base (f90aa65) to head (f0c8f7e).
Report is 1 commits behind head on 2.x.

Additional details and impacted files

@@            Coverage Diff             @@
##              2.x    #5159      +/-   ##
==========================================
- Coverage   68.30%   68.24%   -0.07%     
==========================================
  Files         346      346              
  Lines       24597    24599       +2     
  Branches     4067     4067              
==========================================
- Hits        16802    16788      -14     
- Misses       5873     5888      +15     
- Partials     1922     1923       +1     

Files with missing lines	Coverage Δ
...pensearch/security/tools/democonfig/Installer.java	72.25% <100.00%> (+0.90%)	⬆️

... and 5 files with indirect coverage changes

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