Update HistoricalStdlibs (#2700)

This also:
- fixes a bug in #2699
- improves inferrability of `recall_precompile_state`

Author: timholy

ext/HistoricaStdlibGenerator/generate_historical_stdlibs.jl

@@ -222,7 +222,7 @@ end
 
 # Helper function for getting these printed out in a nicely-sorted order
 function print_sorted(io::IO, d::Dict; indent::Int=0)
-    println(io, "Dict{UUID,Tuple{String,Union{String,Nothing}}}(")
+    println(io, "Dict{UUID,Tuple{String,Union{VersionNumber,Nothing}}}(")
     for pair in sort(collect(d), by = kv-> kv[2][1])
         println(io, " "^indent, repr(pair[1]), " => ", repr(pair[2]), ",")
     end

src/API.jl

@@ -1387,7 +1387,7 @@ function recall_precompile_state()
         if isfile(fpath)
             open(fpath) do io
                 try
-                    pkgspecs = deserialize(io)
+                    pkgspecs = deserialize(io)::Vector{PackageSpec}
                     append!(empty!(store), pkgspecs)
                 catch
                     empty!(store)