Possible bug in `Any` concretization routine

[nilshg]

As discussed on Slack:

julia> using Arrow, DataFrames

julia> Arrow.write("test.arrow", (a = [1, 2], b = Any[3, 4.5]))
"test.arrow"

julia> DataFrame(Arrow.Table("test.arrow"))
2×2 DataFrame
 Row │ a      b        
     │ Int64  Float64  
─────┼─────────────────
   1 │     1  1.5e-323
   2 │     2  4.5

(jl_aYpToJ) pkg> st
      Status `C:\Users\ngudat\AppData\Local\Temp\jl_aYpToJ\Project.toml`
  [69666777] Arrow v2.2.0

[quinnj]

Ok, I've got a fix; just need to figure out an apparent version mismatch between Arrow/ArrowTypes.