compatibility matrices: drop optional=true. (202404)

This is the default now.

Test: TH
Bug: 247575800
Change-Id: I0d7156f4e526b276c47ac66a5125bf2a219b3ed8
Merged-In: I0d7156f4e526b276c47ac66a5125bf2a219b3ed8
1 file changed