ensure mksquashfs has the fragment race fix about bottlerocket-sdk

[tjkirch]

Here are a couple examples from CI runs:

  #17 404.6 Creating 4.0 filesystem on kernel-devel.squashfs, block size 131072.                                                                                                                                                                                                                                                                                                              
[===========================================================|] 10595/10595 100%Write failed because Bad file descriptor                                                                                                                                                                                                                                                                       
  #17 404.6 FATAL ERROR:Failed to write to output filesystem

(I confirmed that disk space and inodes were fine on the above system)

   #18 302.1 Creating 4.0 filesystem on kernel-devel.squashfs, block size 131072.
  #18 302.1 
[===========================================================-] 10343/10343 100%writer: Lseek on destination failed because Bad file descriptor, offset=0xa565d8
  #18 302.1 FATAL ERROR:Probably out of space on output filesystem

[bcressey]

We haven't seen this failure in a while, and I expect it might have been fixed by recent SDK updates that pulled in a newer squashfs-tools package.