aml_tz4_332714050 (11539598,com.google.android.go.tzdata4,com.google.android.tzdata4)
Update FontTools to 4.31.2 to gain access to iterSubTables. am: 0b59a54a78 am: 3e24ea754b am: 3886b0a80e am: 29956f91d3

Original change: https://android-review.googlesource.com/c/platform/external/fonttools/+/2043270

Change-Id: I1584f9c3bbe4713147adc043a6a22ede085e3fd4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>