Upgrade github.com/BurntSushi/toml, dario.cat/mergo

Arran Walkerrequested to merge
ajwalker/upgrade-toml-1.4.0 into main

What does this MR do?

  • Upgrades github.com/BurntSushi/toml
  • Upgrades dario.cat/mergo
  • Omits some missing default values in Connector Config settings.

Why was this MR needed?

Config maintenance.

What's the best way to test this MR?

Existing tests should cover config merging.

What are the relevant issue numbers?

Closes #38231 (closed)

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