[automerger skipped] serde: Enable the “rc” feature am: ec1d580ac9 -s ours am: 4ddfc8d2ff -s ours

am skip reason: Merged-In Ie39d6b842c1718f0f2c4f824388a324df271804e with SHA-1 1fbe19a54c is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/rust/crates/serde/+/22120442

Change-Id: I608354fb63308631d61e8239d9680bd7a57e22c0
Signed-off-by: Automerger Merge Worker <[email protected]>