Extension of the next Kernel SRU cycle

[Kleber Souza]

The next Kernel SRU cycle has been extended by a week. The schedule
for the current and the next cycles and the kernels in -proposed are as
follows:

cycle: 04-Jan through 24-Jan (3 weeks)
====================================================================
          16-Dec   Last day for kernel commits for this cycle.
04-Jan - 08-Jan   Kernel prep week.
11-Jan - 22-Jan   Bug verification & Regression testing.
          25-Jan   Release to -updates.


Kernel Versions
====================================================================
groovy:
     linux:               5.8.0-41.46
focal:
     linux:               5.4.0-65.73
     linux-hwe-5.8:       5.8.0-41.46~20.04.1
bionic:
     linux:               4.15.0-135.139
     linux-hwe-5.4:       5.4.0-65.73~18.04.1
xenial:
     linux:               4.4.0-201.233
     linux-hwe:           4.15.0-133.137~16.04.1


cycle: 25-Jan through 21-Feb (4 weeks)
====================================================================
          20-Jan   Last day for kernel commits for this cycle.
25-Jan - 29-Jan   Kernel prep week.
01-Feb - 19-Feb   Bug verification & Regression testing.
          22-Feb   Release to -updates.