fix: continue using latestTag.sha as base; make delay actually work

[bcoe]

No description provided.

[codecov]

Codecov Report

Merging #394 into master will increase coverage by 1.52%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #394      +/-   ##
==========================================
+ Coverage   79.38%   80.91%   +1.52%     
==========================================
  Files          13       13              
  Lines        2324     2305      -19     
  Branches      197      167      -30     
==========================================
+ Hits         1845     1865      +20     
+ Misses        472      439      -33     
+ Partials        7        1       -6     

Impacted Files	Coverage Δ
src/release-pr.ts	85.77% <ø> (+4.15%)	⬆️
src/github-release.ts	95.20% <0.00%> (-0.80%)	⬇️
src/releasers/php-yoshi.ts	91.01% <0.00%> (+0.78%)	⬆️
src/github.ts	65.54% <0.00%> (+1.62%)	⬆️
src/graphql-to-commits.ts	88.46% <0.00%> (+1.64%)	⬆️
src/conventional-commits.ts	97.27% <0.00%> (+2.72%)	⬆️

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