Bump Microsoft.CodeAnalysis.CSharp.CodeFix.Testing.XUnit from 1.0.0-beta1-63309-01 to 1.0.0-beta1.19264.1

[dependabot-preview]

Bumps Microsoft.CodeAnalysis.CSharp.CodeFix.Testing.XUnit from 1.0.0-beta1-63309-01 to 1.0.0-beta1.19264.1.

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[coveralls]

Coverage remained the same at 91.687% when pulling 54655bb on dependabot/nuget/Microsoft.CodeAnalysis.CSharp.CodeFix.Testing.XUnit-1.0.0-beta1.19264.1 into 455c0d9 on master.

[dependabot-preview]

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If you change your mind, just re-open this PR and I'll resolve any conflicts on it.