Update BurntSushi/toml for MIT-license

Merged username-removed-487110 requested to merge 2785-update-toml-parser into master

What does this MR do?

Update BurntSushi/toml to latest revision so we'll get MIT licensed version instead of WTFPL

Why was this MR needed?

WTFPL has iffy status

Does this MR meet the acceptance criteria?

  • Documentation created/updated
  • Tests
    • Added for this feature/bug
    • All builds are passing
  • Branch has no merge conflicts with master (if you do - rebase it please)

What are the relevant issue numbers?

Closes #2785 (closed)