dependabot(gomod): bump github.com/BurntSushi/toml from 1.5.0 to 1.6.0

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Bumps github.com/BurntSushi/toml from 1.5.0 to 1.6.0.

Release notes

Sourced from github.com/BurntSushi/toml's releases.

v1.6.0

TOML 1.1 is now enabled by default. The TOML changelog has an overview of changes: https://github.com/toml-lang/toml/blob/main/CHANGELOG.md

Also two small fixes:

• Encode large floats as exponent syntax so that round-tripping things like 5e+22 is correct.

• Using duplicate array keys would not give an error:

  arr = [1]
  arr = [2]
  

  This will now correctly give a "Key 'arr' has already been defined" error.

Commits

• 5253492 Enable TOML 1.1 by default (#457)
• e954445 Reject duplicate arrays (#455)
• 6b16cbd Update toml-test test cases from upstream (#456)
• 011fa2b Ensure constant format strings in wf calls
• 4b439bf Remove itemNil
• a473c12 Add test for out of range float64
• b535ff8 Add some boring tests for lex.go
• 6011ef0 Remove unreachable condition in lexTableNameStart
• c8ca9e6 Remove unreachable condition
• 1121f81 Make tomlv read from stdin
• Additional commits viewable in compare view

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