Bump Moq from 4.20.72 to 4.21.0 (#229)

Updated [Moq](https://github.com/moq/moq) from 4.20.72 to 4.21.0.

<details>
<summary>Release notes</summary>

_Sourced from [Moq's releases](https://github.com/moq/moq/releases)._

## 4.21.0

<!-- Release notes generated using configuration in .github/release.yml
at main -->

## What's Changed
### ✨ Implemented enhancements
* Improve performance of It.Is matcher when used with an expression by
compiling only once by @​peterder72 in
devlooped/moq#1512
* Updated ctor params to support nullable args by @​Asafima in
devlooped/moq#1518
* Performance improvement for Mocking many large classes by @​crinksdr
in devlooped/moq#1530
### 🐛 Fixed bugs
* Minor enhancement to avoid null exceptions by @​ShirAvneri in
devlooped/moq#1542
* Fix #​1648 reliably (lazy ValueTask registration + committed harness
verification) by @​kzu in devlooped/moq#1680
### 🔨 Other
* Updated IVerifies.Verifiable method documentation code example by
@​Asafima in devlooped/moq#1528
* Bump dependencies by @​kzu in
devlooped/moq#1545
* Address build warnings by @​kzu in
devlooped/moq#1546
* Enable nullable references in Moq.csproj by @​andrewimcclement in
devlooped/moq#1535
* Bump NuGetizer to 1.4.9 by @​kzu with @​Copilot in
devlooped/moq#1684

## New Contributors
* @​peterder72 made their first contribution in
devlooped/moq#1512
* @​Asafima made their first contribution in
devlooped/moq#1518
* @​crinksdr made their first contribution in
devlooped/moq#1530
* @​ShirAvneri made their first contribution in
devlooped/moq#1542
* @​andrewimcclement made their first contribution in
devlooped/moq#1535
* @​kzu with @​Copilot made their first contribution in
devlooped/moq#1684

**Full Changelog**:
devlooped/moq@v4.20.72...v4.21.0

<!-- sponsors -->

<!-- avoid this section by leaving a nosponsors tag -->
## Sponsors

The following sponsors made this release possible: @​clarius,
@​MFB-Technologies-Inc, @​sandrock, @​drivenet, @​Keflon, @​tbolon,
@​rbnswartz, @​jfoshee, @​Mrxx99, @​eajhnsn1, @​Jonathan-Hickey,
@​KenBonny, @​SimonCropp, @​agileworks-eu, @​arsdragonfly, @​vezel-dev,
@​ChilliCream, @​4OTC, @​DominicSchell, @​adalon, @​torutek,
@​mccaffers, @​SeikaLogiciel, @​wizardness, @​eska-gmbh, @​geodata-no.

Thanks 💜

<!-- /sponsors -->



Commits viewable in [compare
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Directory.Packages.props

@@ -9,7 +9,7 @@
     <PackageVersion Include="Microsoft.CodeAnalysis.NetAnalyzers" Version="10.0.401" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.10.1" />
     <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="10.0.401" />
-    <PackageVersion Include="Moq" Version="4.20.72" />
+    <PackageVersion Include="Moq" Version="4.21.0" />
     <PackageVersion Include="xunit" Version="2.9.3" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="4.0.0" />
   </ItemGroup>