fix(cssnano-preset-advanced): update autoprefixer

[ludofischer]

Update autoprefixer and regenerate the integration tests.
Now adds the -webkit prefix to position: sticky.

[codecov-commenter]

Codecov Report

Merging #1213 (aba4b6d) into master (b67cdc4) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1213   +/-   ##
=======================================
  Coverage   96.53%   96.53%           
=======================================
  Files         116      116           
  Lines        3611     3611           
  Branches     1063     1063           
=======================================
  Hits         3486     3486           
  Misses        117      117           
  Partials        8        8           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update b67cdc4...aba4b6d. Read the comment docs.