re-calibrate limit based on mainnet data (backport #21995)

[mergify]

This is an automatic backport of pull request #21995 done by Mergify.
Cherry-pick of d743c29 has failed:

On branch mergify/bp/v1.8/pr-21995
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	both modified:   runtime/src/block_cost_limits.rs

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[mergify]

automerge label removed due to a CI failure

[codecov]

Codecov Report

Merging #22211 (e6d2665) into v1.8 (a53dd61) will decrease coverage by 0.0%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             v1.8   #22211     +/-   ##
=========================================
- Coverage    81.6%    81.5%   -0.1%     
=========================================
  Files         459      459             
  Lines      130962   130962             
=========================================
- Hits       106873   106857     -16     
- Misses      24089    24105     +16     

[github-actions]

This PR has been automatically locked since there has not been any activity in past 14 days after it was merged.