fix heap snapshot is valid char check

Author: IanButterworth

stdlib/Manifest.toml

@@ -191,7 +191,6 @@ uuid = "de0858da-6303-5e67-8744-51eddeeeb8d7"
 version = "1.11.0"
 
 [[deps.Profile]]
-deps = ["Unicode"]
 uuid = "9abbd945-dff8-562f-b5e8-e1ebf5ef1b79"
 version = "1.11.0"
 

stdlib/Profile/Project.toml

@@ -2,12 +2,6 @@ name = "Profile"
 uuid = "9abbd945-dff8-562f-b5e8-e1ebf5ef1b79"
 version = "1.11.0"
 
-[deps]
-Unicode = "4ec0a83e-493e-50e2-b9ac-8f72acf5a8f5"
-
-[compat]
-Unicode = "1.11.0"
-
 [extras]
 Base64 = "2a0f44e3-6c83-55bd-87e4-b1978d98bd5f"
 Logging = "56ddb016-857b-54e1-b83d-db4d58db5568"

stdlib/Profile/src/heapsnapshot_reassemble.jl

@@ -2,8 +2,6 @@
 
 module HeapSnapshot
 
-using Unicode
-
 """
     assemble_snapshot(filepath::AbstractString, out_file::AbstractString)
 
@@ -236,7 +234,7 @@ function print_str_escape_json(stream::IO, s::AbstractString)
             print(stream, "\\t")
         elseif '\x00' <= c <= '\x1f'
             print(stream, "\\u", lpad(string(UInt16(c), base=16), 4, '0'))
-        elseif !Unicode.isassigned(c)
+        elseif !isvalid(c)
             # we have to do this because vscode's viewer doesn't like the replace character
             print(stream, "[invalid unicode character]")
         else