submodule: Bump fedora-coreos-config

Mostly for coreos/fedora-coreos-config#717 for coreos/ignition#1108

Shortlog with bot lockfile bumps omitted:

```
Kelvin Fan (4):
      coreos-copy-firstboot-network.sh: Place stamp file if copied
      30ignition-coreos: Add `coreos-boot-edit.{service,sh}`
      15coreos-network/coreos-copy-firstboot-network.sh: No stamp file
      05core: Merge `coreos-inject-rootmap.service` into `coreos-boot-edit.service`

Sohan Kunkerkar (2):
      overrides: fast-track Ignition 2.8.0
      40ignition-conf: remove legacy base config
```