Upgrade regex-syntax to 0.6.29 am: 713de16f11 am: d9f74f32a9

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/regex-syntax/+/2519958

Change-Id: Ia9d82d9c0be3f3ba6cd45121e499c903774cacfc
Signed-off-by: Automerger Merge Worker <[email protected]>