[Release-1.27] Pin opa version for missing dependency chain

[dereknola]

Proposed Changes

Partial backport of #9213 to release-1.27

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (287d6b2) 47.65% compared to head (4d84832) 44.60%.
Report is 1 commits behind head on release-1.27.

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.27    #9217      +/-   ##
================================================
- Coverage         47.65%   44.60%   -3.05%     
================================================
  Files               154      154              
  Lines             16407    16407              
================================================
- Hits               7818     7318     -500     
- Misses             7341     7916     +575     
+ Partials           1248     1173      -75     

Flag	Coverage Δ
e2etests	?
inttests	42.22% <ø> (+1.38%)	⬆️
unittests	14.41% <ø> (ø)

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