fix: sort commits from graphql output by descending commit date so we get fresh results

[feywind]

Fix for a bug found in the work for #428

[codecov]

Codecov Report

Merging #585 into master will decrease coverage by 0.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #585      +/-   ##
==========================================
- Coverage   81.03%   80.94%   -0.09%     
==========================================
  Files          85       85              
  Lines        9995     9999       +4     
  Branches      711      810      +99     
==========================================
- Hits         8099     8094       -5     
- Misses       1884     1893       +9     
  Partials       12       12              

Impacted Files	Coverage Δ
src/github.ts	80.99% <100.00%> (+0.04%)	⬆️
src/releasers/java/bump_type.ts	76.31% <0.00%> (-2.64%)	⬇️
...ase/release-please/src/releasers/java/bump_type.ts	76.31% <0.00%> (-2.64%)	⬇️
D:/a/release-please/release-please/src/github.ts	74.94% <0.00%> (-1.65%)	⬇️
src/release-pr-factory.ts	81.96% <0.00%> (-1.64%)	⬇️
...-please/release-please/src/conventional-commits.ts	95.12% <0.00%> (-1.22%)	⬇️
src/releasers/java/version.ts	94.68% <0.00%> (-1.07%)	⬇️
.../a/release-please/release-please/src/release-pr.ts	86.70% <0.00%> (-0.95%)	⬇️
...se-please/release-please/src/graphql-to-commits.ts	86.25% <0.00%> (-0.95%)	⬇️
...elease-please/release-please/src/releasers/node.ts	89.85% <0.00%> (-0.73%)	⬇️
... and 18 more

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