chromedriver: 2.38 -> 2.39 (#41580)

Semi-automatic update generated by https://github.com/ryantm/nixpkgs-update tools.

This update was made based on information from https://repology.org/metapackage/chromedriver/versions.

These checks were done:

- built on NixOS
- /nix/store/r7ai8p033gdhncxsfjjy3rb8qmcsvpqx-chromedriver-2.39/bin/chromedriver passed the binary check.
- Warning: no invocation of /nix/store/r7ai8p033gdhncxsfjjy3rb8qmcsvpqx-chromedriver-2.39/bin/.chromedriver-wrapped had a zero exit code or showed the expected version
- 1 of 2 passed binary check by having a zero exit code.
- 0 of 2 passed binary check by having the new version present in output.
- found 2.39 with grep in /nix/store/r7ai8p033gdhncxsfjjy3rb8qmcsvpqx-chromedriver-2.39
- directory tree listing: https://gist.github.com/ed47d14dfe1661b73d2d877b6e790579
- du listing: https://gist.github.com/63dc7bb82190375bce025de50ed2d6fa