Add some missing world age increments

Was missing increments after closure type declarations and a kwarg function
declaration. Fixes the world age warnings when running tests.  Part of
JuliaLang/julia#56509

Author: mlechu

src/closure_conversion.jl

@@ -389,6 +389,7 @@ function _convert_closures(ctx::ClosureConversionCtx, ex)
                     type_for_closure(ctx, ex, name_str, field_syms, field_is_box)
                 if !ctx.is_toplevel_seq_point
                     push!(ctx.toplevel_stmts, closure_type_def)
+                    push!(ctx.toplevel_stmts, @ast ctx ex [K"latestworld_if_toplevel"])
                     closure_type_def = nothing
                 end
                 closure_info = ClosureInfo(closure_type_, field_syms, field_inds)
@@ -413,6 +414,7 @@ function _convert_closures(ctx::ClosureConversionCtx, ex)
                 end
                 @ast ctx ex [K"block"
                     closure_type_def
+                    [K"latestworld_if_toplevel"]
                     closure_type := if isempty(type_params)
                         closure_type_
                     else

src/desugaring.jl

@@ -2811,6 +2811,7 @@ function keyword_function_defs(ctx, srcref, callex_srcref, name_str, typevar_nam
 
     kw_func_method_defs = @ast ctx srcref [K"block"
         [K"function_decl" body_func_name]
+        [K"latestworld"]
         [K"scope_block"(scope_type=:hard)
             [K"method_defs"
                 body_func_name