Release 1.12.8

[1.12.8] - 2024-04-02

Added

• function io/file-normalize-utf. This is useful to make it easier to process
  MacOS filenames with umlauts.
• thread type support to the function thread to allow spawning daemon or user
  threads
• support for tracing exceptions in trace/trace-var
• math function rand-bigint. Venice uses this function to create unique
  boundary strings for multipart HTTP requests.
• function mimetypes/probe-content-type to get mimetypes for file names.