chrono: enable "serde" feature am: b439b3182b am: 0bd811eecd am: 9ba9d2600c am: aace0241b7

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/chrono/+/2513913

Change-Id: Ic95ae4ccebc8a6d854594ce2b57d0af780e39e1e
Signed-off-by: Automerger Merge Worker <[email protected]>