chore: bumping opa to 0.68.0

[JaydipGabani]

What this PR does / why we need it: Bumping opa to 0.68.0.

Which issue(s) this PR fixes (optional, using fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when the PR gets merged):
Fixes #

Special notes for your reviewer:

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 48.19%. Comparing base (3350319) to head (5119662).
⚠️ Report is 655 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (3350319) and HEAD (5119662). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (3350319)	HEAD (5119662)
unittests	2	1

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3561      +/-   ##
==========================================
- Coverage   54.49%   48.19%   -6.31%     
==========================================
  Files         134      218      +84     
  Lines       12329    15134    +2805     
==========================================
+ Hits         6719     7294     +575     
- Misses       5116     7026    +1910     
- Partials      494      814     +320     

Flag	Coverage Δ
unittests	48.19% <ø> (-6.31%)	⬇️

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[maxsmythe]

LGTM