v1.16: Update ShredFetchStage::modify_packets to drop root bank quicker (backport of #33105)

[mergify]

This is an automatic backport of pull request #33105 done by Mergify.
Cherry-pick of ad33c68 has failed:

On branch mergify/bp/v1.16/pr-33105
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	both modified:   core/src/shred_fetch_stage.rs

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[codecov]

Codecov Report

Merging #33152 (94c6518) into v1.16 (6fbe8ba) will decrease coverage by 0.1%.
Report is 35 commits behind head on v1.16.
The diff coverage is 91.9%.

@@            Coverage Diff            @@
##            v1.16   #33152     +/-   ##
=========================================
- Coverage    81.9%    81.9%   -0.1%     
=========================================
  Files         762      762             
  Lines      208010   207801    -209     
=========================================
- Hits       170533   170334    -199     
+ Misses      37477    37467     -10