[coreboot] The coreboot 4.21 release tag in 1 week

[coreboot org]

Hello coreboot,
  This is the  notification that we're one week away from doing the
coreboot 4.21 release tag on August 21st.

As mentioned previously, we will have a 1 week delay after the new
version is tagged to allow for testing after the release.  This will
give us a chance to fix any issues that are found during the release
process before making the release public.  The 4.21 announcement is
scheduled for August 28th.

If you have any questions or concerns, please let the coreboot release
team know. We're using the IRC channel #coreboot_release to coordinate
our activities.

Martin