Update dependency logger to v2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
logger	dependencies	major	^1.1.0 -> ^2.0.0

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Release Notes

SourceHorizon/logger (logger)

v2.4.0

• Added pub.dev topics. Thanks to
  @​jonasfj (#​74).
• PrettyPrinter: Added dateTimeFormat option (backwards-compatible with printTime).
  Fixes #​80.

v2.3.0

• AdvancedFileOutput: Added file deletion option. Thanks to
  @​lomby92 (#​71).

v2.2.0

• Added AdvancedFileOutput. Thanks to
  @​pyciko (#​65).
• Added missing acknowledgments in README.

v2.1.0

• Improved README explanation about debug mode. Thanks to
  @​gkuga (#​57).
• Added web safe export. Fixes #​58.
• Added logger.init to optionally await any async init() methods.
  Fixes #​61.

v2.0.2+1

• Meta update: Updated repository links to https://github.com/SourceHorizon/logger.

v2.0.2

• Meta update: Updated repository links to https://github.com/SourceHorizon/logger.

v2.0.1

• Updated README to reflect v2.0.0 log signature change.

v2.0.0

• Fixed supported platforms list.
• Removed reference to outdated logger_flutter project.
  Thanks to @​yangsfang (#​32).
• Added override capability for logger defaults.
  Thanks to @​yangsfang (#​34).
• Level.verbose, Level.wtf and Level.nothing have been deprecated and are replaced
  by Level.trace, Level.fatal and Level.off.
  Additionally Level.all has been added.
• PrettyPrinter: Added levelColors and levelEmojis as constructor parameter.

Breaking changes

• log signature has been changed to closer match dart's developer log function and allow for
  future
  optional parameters.

  Additionally, time has been added as an optional named parameter to support providing custom
  timestamps for LogEvents instead of DateTime.now().

Migration:

- Before:
  ```dart
  logger.e("An error occurred!", error, stackTrace);
  ```
- After:
  ```dart
  logger.e("An error occurred!", error: error, stackTrace: stackTrace);
  ```

• init and close methods of LogFilter, LogOutput and LogPrinter are now async along
  with Logger.close().
  (Fixes FileOutput)
• LogListeners are now called on every LogEvent independent of the filter.
• PrettyPrinter: includeBox is now private.
• PrettyPrinter: errorMethodCount is now only considered if an error has been provided.
  Otherwise methodCount is used.
• PrettyPrinter: Static levelColors and levelEmojis have been renamed to defaultLevelColors
  and defaultLevelEmojis and are used as fallback for their respective constructor parameters.
• Levels are now sorted by their respective value instead of the enum index (Order didn't change).

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