chore: update to rust 1.85

[nathanwhit]

Updates to use rust 1.85. Doesn't move to the 2024 edition, as that's a fair bit more involved.

A nice side benefit is that the new rustc version seems to lead to a slight reduction in binary size (at least on mac):

    FILE SIZE   
 -------------- 
  +4.3%  +102Ki    __DATA_CONST,__const
  [NEW] +69.3Ki    __TEXT,__literals
  [NEW] +68.5Ki    Rebase Info
  +5.0% +39.9Ki    __TEXT,__unwind_info
   +57% +8.85Ki    [__TEXT]
  [NEW] +8.59Ki    Lazy Binding Info
  [NEW] +5.16Ki    __TEXT,__stub_helper
  [NEW] +3.58Ki    Export Info
  [NEW] +3.42Ki    __DATA,__la_symbol_ptr
  -0.1%    -726    [12 Others]
 -21.4% -3.10Ki    [__DATA_CONST]
 -95.8% -3.39Ki    __DATA_CONST,__got
 -20.9% -3.43Ki    [__DATA]
  -0.5% -4.52Ki    Code Signature
 -100.0% -11.6Ki    [__LINKEDIT]
  -1.0% -43.5Ki    Symbol Table
  -1.6% -44.0Ki    __TEXT,__gcc_except_tab
  -0.2% -48.1Ki    __TEXT,__const
  -3.3% -78.6Ki    __TEXT,__eh_frame
  -0.7%  -320Ki    __TEXT,__text
  -1.5%  -334Ki    String Table
  -0.5%  -586Ki    TOTAL

[dsherret]

LGTM

[dsherret]

Dismissing my review. As Divy pointed out, seems like something went wrong rebasing. I recommend not using rebase/force pushing in PRs and instead just use merge commits because it’s easier for people to review updates to PRs.