Bump ol from 6.4.0 to 6.4.2
Bump ol from 6.4.0 to 6.4.2

Bumps [ol](https://github.com/openlayers/openlayers) from 6.4.0 to 6.4.2.
- [Release notes](https://github.com/openlayers/openlayers/releases)
- [Commits](https://github.com/openlayers/openlayers/compare/v6.4.0...v6.4.2)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
hslayers/hslayers-ng,hslayers/hslayers-ng,hslayers/hslayers-ng,hslayers/hslayers-ng