Update Dart (pub) non-major updates

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ffigen (source)	dev_dependencies	patch	20.1.0 → 20.1.1
toml	dependencies	minor	0.17.0 → 0.18.0

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Release Notes

dart-lang/native (ffigen)

v20.1.1

Compare Source

• Update tests and examples now that package:objective_c is using native assets.

just95/toml.dart (toml)

v0.18.0

Compare Source

• Support for TOML [v1.1.0][toml-spec/v1.1.0] has been added.
  • Newlines and trailing commas are now allowed in inline tables.
  • The seconds part of offset date-times, local date-times and local times is now optional.
    • If the seconds part is omitted TomlPartialTime.seconds is set to 0.
    • If a TomlPartialTime with TomlPartialTime.seconds == 0 is encoded and TomlPartialTime.secondFractions is empty, the seconds part is omitted.
  • Added escape sequence \e for the escape character (U+001B).
  • Added escape sequence \xHH for code points in the range of U+0000 to U+00FF.
    • The encoder will use this type of escape sequence to encode control characters in basic strings and multiline basic strings that do not have a corresponding one letter escape sequence.
• The encoder will now throw a TomlImpossibleEscapeSequenceException instead of a TomlInvalidEscapeSequenceException if it encounters a code point that cannot be represented using any supported escape sequence.
  This can happen for example, when the encoded string contains unpaired UTF-16 surrogate code points.

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