Update git submodules
- Update extensions/AbuseFilter from branch 'REL1_42' to 8556c1b0dc4849ca9ddadfbfb02a11e1da248672
- Fixup T372998 backport
Use isHidden due to ca23e9f06b53e93dfd8ea32d694c6f27b1e8c361 from T363906 being in REL1_43+
Bug: T372998 Change-Id: Ib802822e47aa9d4c848069d0509a4d23374e6b0e
- Fixup T372998 backport