Update dependency Polly to 7.2.4 - autoclosed

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This PR contains the following updates:

Package	Change	Age	Confidence
Polly	7.1.1 -> 7.2.4

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Release Notes

App-vNext/Polly (Polly)

v7.2.4

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• Fixed an incorrect exception argument - Thanks to @​FoxTes
• Upgrade FluentAssertions - Thanks to @​dotnetspark
• Upgrade Cake - Thanks to @​eugeneogongo
• Fixed possible NullReferenceException - Thanks to @​FoxTes
• Migrate build to GitHub Actions - Thanks to @​martincostello
• Authenticode sign the assembly and NuGet package - Thanks to @​martincostello and the .NET Foundation

v7.2.3

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• Add RateLimit policy - Thanks to @​reisenberger
• Various codebase health updates - Thanks to @​SimonCropp
• Add benchmarks project - Thanks to @​martincostello
• Fix broken README image - Thanks to @​GitHubPang

v7.2.2

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• Recursively search all AggregateException inner exceptions for predicate matches when using HandleInner() (#​818) - Thanks to @​sideproject
• Polly now builds deterministically - Thanks to @​304NotModified
• Bug fix: the timeoutStrategy parameter was not being used by the TimeoutAsync(Func<TimeSpan>, TimeoutStrategy, Func<Context, TimeSpan, Task, Task>) method - Thanks to @​martincostello
• Bug fix: the solution can now be built with the .NET 5.0 SDK - Thanks to @​martincostello

v7.2.1

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• Upgrade SourceLink to RTM v1 (fixes building from source for latest .NET Core 3.1.x)
• Bug fix: rare circuit-breaker race condition causing NullReferenceException when circuit throws BrokenCircuitException.

v7.2.0

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• Add test target for netcoreapp3.0.
• Extend PolicyRegistry with concurrent method support, TryAdd, TryRemove, TryUpdate, GetOrAdd, AddOrUpdate; new interface IConcurrentPolicyRegistry
• Improve .NET Framework support: Add explicit targets for .NET Framework 4.6.1 and 4.7.2.
• TimeoutPolicy: if timeout occurs while a user exception is being marshalled (edge case race condition), do not mask user exception (fix issue 620)
• Enhance debugging/stacktrace experience for some contexts: Include pdb symbols in package again.

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