Bump picomatch in /src/wp-content/themes/twentynineteen

Bumps  and [picomatch](https://github.com/micromatch/picomatch). These dependencies needed to be updated together.

Updates `picomatch` from 2.3.1 to 2.3.2
- [Release notes](https://github.com/micromatch/picomatch/releases)
- [Changelog](https://github.com/micromatch/picomatch/blob/master/CHANGELOG.md)
- [Commits](micromatch/picomatch@2.3.1...2.3.2)

Updates `picomatch` from 4.0.3 to 4.0.4
- [Release notes](https://github.com/micromatch/picomatch/releases)
- [Changelog](https://github.com/micromatch/picomatch/blob/master/CHANGELOG.md)
- [Commits](micromatch/picomatch@2.3.1...2.3.2)

---
updated-dependencies:
- dependency-name: picomatch
  dependency-version: 2.3.2
  dependency-type: indirect
- dependency-name: picomatch
  dependency-version: 4.0.4
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]