FIX: improved ibis pin load time

[maxcapodi78]

Description

Ibisreader was unecessarly reloading the file every buffer.

Issue linked

Please mention the issue number or describe the problem this pull request addresses.

Checklist

• I have tested my changes locally.
• I have added necessary documentation or updated existing documentation.
• I have followed the coding style guidelines of this project.
• I have added appropriate tests (unit, integration, system).
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved by the PR if any.
• I have agreed with the Contributor License Agreement (CLA).

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.24%. Comparing base (d97a29e) to head (e349d95).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6181      +/-   ##
==========================================
- Coverage   85.25%   85.24%   -0.01%     
==========================================
  Files         170      170              
  Lines       64100    64104       +4     
==========================================
- Hits        54647    54646       -1     
- Misses       9453     9458       +5     

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