chore(deps): Update .net deps to v4 (major) (#113)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [NUnit](https://nunit.org/)
([source](https://togithub.com/nunit/nunit)) | `3.14.0` -> `4.0.1` |
[![age](https://developer.mend.io/api/mc/badges/age/nuget/NUnit/4.0.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/nuget/NUnit/4.0.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
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|
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|
| [cake.tool](https://cakebuild.net/)
([source](https://togithub.com/cake-build/cake)) | `3.2.0` -> `4.0.0` |
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|
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|
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|
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|

---

### Release Notes

<details>
<summary>nunit/nunit (NUnit)</summary>

### [`v4.0.1`](https://togithub.com/nunit/nunit/releases/tag/v4.0.1):
NUnit 4.0.1

Patch release to fix windows targets

See [release
notes](https://docs.nunit.org/articles/nunit/release-notes/framework.html#nunit-401---december-2-2023)
and
See [migration
guide](https://docs.nunit.org/articles/nunit/release-notes/Nunit4.0-MigrationGuide.html)

###
[`v4.0.0`](https://togithub.com/nunit/nunit/blob/HEAD/CHANGES.md#NUnit-400---November-26-2023)

All changes, see [release
notes](https://docs.nunit.org/articles/nunit/release-notes/framework.html#nunit-400)

</details>

<details>
<summary>cake-build/cake (cake.tool)</summary>

###
[`v4.0.0`](https://togithub.com/cake-build/cake/blob/HEAD/ReleaseNotes.md#New-in-400-Released-20231118)

-   4266 Update LatestPotentialBreakingChange to 4.0.0.
- 4132 Add File APIs for setting timestamps (creation time, last write
time, last access time).
-   4250 Update System.Collections.Immutable to 8.0.0.
-   4260 Unzip alias should support overwrite files.
-   4251 Update System.Reflection.Metadata 8.0.0.
-   4249 Update Microsoft.Extensions.DependencyInjection to 8.0.0.
- 4197 Execution of Cake script fails if an addin defines an alias that
uses nullable reference types in its signature.
- 4150 Cake script is contributing unactionable diagnostics in VS Code
Problems pane.

</details>

---

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dotnet-tools.json

@@ -3,7 +3,7 @@
   "isRoot": true,
   "tools": {
     "cake.tool": {
-      "version": "3.2.0",
+      "version": "4.0.0",
       "commands": [
         "dotnet-cake"
       ]

src/Sdk.UnitTests/Cerbos/Sdk/UnitTests/CerbosClientTest.cs

@@ -225,15 +225,15 @@ public void PlanResources()
             PlanResourcesFilter.Types.Expression.Types.Operand cond = have.Filter.Condition;
             PlanResourcesFilter.Types.Expression expr = cond.Expression;
 
-            Assert.NotNull(expr);
+            Assert.That(expr, !Is.Null);
             Assert.That(expr.Operator, Is.EqualTo("and"));
 
             PlanResourcesFilter.Types.Expression argExpr = expr.Operands[0].Expression;
-            Assert.NotNull(argExpr);
+            Assert.That(argExpr, !Is.Null);
             Assert.That(argExpr.Operator, Is.EqualTo("eq"));
 
             PlanResourcesFilter.Types.Expression argExpr1 = expr.Operands[1].Expression;
-            Assert.NotNull(argExpr1);
+            Assert.That(argExpr1, !Is.Null);
             Assert.That(argExpr1.Operator, Is.EqualTo("eq"));
         }
 

src/Sdk.UnitTests/Sdk.UnitTests.csproj

@@ -8,7 +8,7 @@
 
     <ItemGroup>
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
-        <PackageReference Include="NUnit" Version="3.14.0" />
+        <PackageReference Include="NUnit" Version="4.0.1" />
         <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
         <PackageReference Include="NUnit.Analyzers" Version="3.10.0" />
         <PackageReference Include="coverlet.collector" Version="6.0.0" />