chore(deps): bump Ardalis.GuardClauses from 4.4.0 to 4.5.0 (#1284)

Bumps [Ardalis.GuardClauses](/~https://github.com/ardalis/guardclauses) from 4.4.0 to 4.5.0.
- [Release notes](/~https://github.com/ardalis/guardclauses/releases)
- [Commits](ardalis/GuardClauses@v4.4.0...v4.5)

---
updated-dependencies:
- dependency-name: Ardalis.GuardClauses
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Rnwood.Smtp4dev/Rnwood.Smtp4dev.csproj

@@ -22,7 +22,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Ardalis.GuardClauses" Version="4.4.0" />
+    <PackageReference Include="Ardalis.GuardClauses" Version="4.5.0" />
     <PackageReference Include="CommandLiners.MonoOptions" Version="1.0.36" />
     <PackageReference Include="HtmlAgilityPack" Version="1.11.59" />
     <PackageReference Include="MailKit" Version="4.3.0" />