Bump Iced from 1.20.0 to 1.21.0

Bumps [Iced](https://github.com/icedland/iced) from 1.20.0 to 1.21.0.
- [Release notes](https://github.com/icedland/iced/releases)
- [Commits](icedland/iced@v1.20.0...v1.21.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Directory.Packages.props

@@ -38,7 +38,7 @@
         <PackageVersion Include="EmailValidation"
                         Version="1.0.10" />
         <PackageVersion Include="Iced"
-                        Version="1.20.0" />
+                        Version="1.21.0" />
         <PackageVersion Include="Injectio"
                         Version="3.1.0" />
         <PackageVersion Include="Markdig"