build(deps): bump Polyfill from 5.2.2 to 5.3.0

[dependabot[bot]]

Bumps Polyfill from 5.2.2 to 5.3.0.

Commits

• 6ac3cab Update Directory.Build.props
• 5ad8cf2 add Enum.TryParse (#183)
• 1173d93 cleanup
• 737eb8b add Enum.Parse (#182)
• 74c058e remove NullabilitySync
• e4503ab central package management
• eb08a0d refs
• 6e67a22 Update Directory.Build.props
• 245a99a Update PolyfillTests_StringBuilder.cs
• 6fbb556 Update PolyfillTests_StringBuilder.cs
• Additional commits viewable in compare view

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[dependabot[bot]]

Superseded by #355.