Merge "Upgrade curl to curl-7_73_0" am: ef7f818b85 am: 0e719561e7 am: faad33a788

Original change: https://android-review.googlesource.com/c/platform/external/curl/+/1478459

Change-Id: I525b6f0ced5174dc4f16f08f99c552641c77c699