deps: Bump the test-frameworks group with 3 updates (#489)

Bumps TUnit from 1.63.0 to 1.64.6
Bumps TUnit.Assertions from 1.63.0 to 1.64.6
Bumps TUnit.Engine from 1.63.0 to 1.64.6

---
updated-dependencies:
- dependency-name: TUnit
  dependency-version: 1.64.6
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: test-frameworks
- dependency-name: TUnit.Assertions
  dependency-version: 1.64.6
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: test-frameworks
- dependency-name: TUnit.Engine
  dependency-version: 1.64.6
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: test-frameworks
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Directory.Packages.props

@@ -30,9 +30,9 @@
     <PackageVersion Include="FSharp.Core" Version="10.1.302" />
     <!-- Test infrastructure -->
     <PackageVersion Include="xunit.v3.mtp-v2" Version="3.2.2" />
-    <PackageVersion Include="TUnit" Version="1.63.0" />
-    <PackageVersion Include="TUnit.Assertions" Version="1.63.0" />
-    <PackageVersion Include="TUnit.Engine" Version="1.63.0" />
+    <PackageVersion Include="TUnit" Version="1.64.6" />
+    <PackageVersion Include="TUnit.Assertions" Version="1.64.6" />
+    <PackageVersion Include="TUnit.Engine" Version="1.64.6" />
     <PackageVersion Include="Microsoft.Testing.Extensions.TrxReport" Version="2.3.3" />
     <PackageVersion Include="Microsoft.Testing.Extensions.CodeCoverage" Version="18.9.0" />
     <PackageVersion Include="Microsoft.Testing.Extensions.CrashDump" Version="2.3.3" />