build(deps): bump third_party/netlistsvg from `850b0a8` to `d6690b6`
build(deps): bump third_party/netlistsvg from `850b0a8` to `d6690b6`

Bumps [third_party/netlistsvg](https://github.com/nturley/netlistsvg) from `850b0a8` to `d6690b6`.
- [Release notes](https://github.com/nturley/netlistsvg/releases)
- [Commits](https://github.com/nturley/netlistsvg/compare/850b0a85aa4ec454807981a207126023c092ab63...d6690b668d7c7414304365780cc9aac43d8c7d31)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
SymbiFlow/symbiflow-arch-defs,SymbiFlow/symbiflow-arch-defs