Bump Flurl from 3.0.7 to 4.0.0

Bumps [Flurl](https://github.com/tmenier/Flurl) from 3.0.7 to 4.0.0.
- [Release notes](https://github.com/tmenier/Flurl/releases)
- [Commits](tmenier/Flurl@Flurl.3.0.7...Flurl.4.0.0)

---
updated-dependencies:
- dependency-name: Flurl
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Directory.Packages.props

@@ -33,7 +33,7 @@
     <PackageVersion Include="FastEndpoints.Swagger" Version="5.19.2" />
     <PackageVersion Include="FastEndpoints.Swagger.Swashbuckle" Version="2.2.0" />
     <PackageVersion Include="FluentAssertions" Version="6.12.0" />
-    <PackageVersion Include="Flurl" Version="3.0.7" />
+    <PackageVersion Include="Flurl" Version="4.0.0" />
     <PackageVersion Include="Flurl.Http" Version="3.2.4" />
     <PackageVersion Include="GoogleReCaptcha.V3" Version="1.3.1" />
     <PackageVersion Include="Markdig" Version="0.33.0" />