Update dependency flutter_svg to v1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
flutter_svg	dependencies	major	^0.19.3 -> ^1.0.0

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Release Notes

dnfield/flutter_svg

v1.0.3

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• Fix bugs in picture disposal.

v1.0.2

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• Avoid cache invalidation when currentColor or font based units are not used.
• Support rem units.

v1.0.1

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• Fix bug with incorrect fills in some cases of <use> elements.
• Analysis cleanup of Dart code.
• Fix bug where self-closing <g> tags could alter rendering.
• Fix bug where an invalid @stroke-dasharray could cause an infinite loop.
• Fix bugs related to nested <g> elements in <defs>.
• Remove unnecessary sync* related code.

v1.0.0

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• New widget/RenderObject implementation to avoid rebuilds/paints when
  near or overlapping an animating widget. Also should improve raster
  cacheability.
• Correctly list web as a supported platform.
• Support for em/ex units.
• Stable 1.0.0 release.

v0.23.0+1

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• Missing commit that reduced breakages introduced in 0.23.0

v0.23.0

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• Missing commit that reduced breakages introduced in 0.23.0

v0.22.0

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• Expose PictureCache on PictureProvider, and deprecate
  PictureProvider.cacheCount and PictureProvider.clearCache. This is
  intended to allow users to set a maximum cache size, which was previously
  impossible.

v0.21.0+1

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• Fix alignment/sizing issues introduced in 0.21.0

v0.21.0

• Fix alignment/sizing issues introduced in 0.21.0

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