fix compile error in new rust version

[pengge]

link solution

error[E0282]: type annotations needed for `Box<_>`
  --> **\registry\src\rsproxy.cn-0dccff568467c15b\time-0.3.31\src\format_description\parse\mod.rs:83:9
   |
83 |     let items = format_items
   |         ^^^^^
...
86 |     Ok(items.into())
   |              ---- type must be known at this point
   |
help: consider giving `items` an explicit type, where the placeholders `_` are specified
   |
83 |     let items: Box<_> = format_items
   |              ++++++++