Bumped SDK Version and dependencies

[mZadorskii]

• Bumped SDK Version
• Bumped dependencies
• Fined lints and formatting
• Regenerated goldends

[codecov-commenter]

Codecov Report

Merging #167 (3cf15d5) into master (b8cf574) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #167   +/-   ##
=======================================
  Coverage   99.72%   99.72%           
=======================================
  Files          12       12           
  Lines         364      369    +5     
=======================================
+ Hits          363      368    +5     
  Misses          1        1           

Impacted Files	Coverage Δ
...ackages/golden_toolkit/lib/src/device_builder.dart	100.00% <100.00%> (ø)
packages/golden_toolkit/lib/src/testing_tools.dart	100.00% <100.00%> (ø)
...lden_toolkit/lib/src/widget_tester_extensions.dart	100.00% <100.00%> (ø)
packages/golden_toolkit/lib/src/device.dart	100.00% <0.00%> (ø)
...ages/golden_toolkit/lib/src/test_asset_bundle.dart	100.00% <0.00%> (ø)

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