fix: sed on specific tag in make release-manifest

[chewong]

What this PR does / why we need it:

Fixes a bug in the release process where it accidentally bumped the tag of the curl image.

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 54.39%. Comparing base (f1bbd65) to head (f853932).
Report is 888 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2153      +/-   ##
==========================================
+ Coverage   54.35%   54.39%   +0.04%     
==========================================
  Files         111      111              
  Lines        9530     9530              
==========================================
+ Hits         5180     5184       +4     
+ Misses       3951     3949       -2     
+ Partials      399      397       -2     

Flag	Coverage Δ
unittests	54.39% <ø> (+0.04%)	⬆️

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[sozercan]

LGTM