ci: Fail publishing workflow if trying to release a duplicate version + bump to 6.0.0 (#127)

* Fail if trying to publish a duplicate NuGet package

* Bump version to 6.0.0

Author: rolodato

.github/workflows/release.yml

@@ -80,12 +80,10 @@ jobs:
         uses: actions/setup-dotnet@v4
 
       # Publish all NuGet packages to NuGet.org
-      # Use --skip-duplicate to prevent errors if a package with the same version already exists.
-      # If you retry a failed workflow, already published packages will be skipped without error.
       - name: Publish NuGet package
         run: |
           foreach($file in (Get-ChildItem "${{ env.NuGetDirectory }}" -Recurse -Include *.nupkg)) {
-              dotnet nuget push $file --api-key "${{ secrets.NUGET_APIKEY }}" --source https://api.nuget.org/v3/index.json --skip-duplicate
+              dotnet nuget push $file --api-key "${{ secrets.NUGET_APIKEY }}" --source https://api.nuget.org/v3/index.json
           }
 
       - name: Upload Release Asset

Flagsmith.FlagsmithClient/Flagsmith.FlagsmithClient.csproj

@@ -7,7 +7,7 @@
     <CopyLocalLockFileAssemblies>true</CopyLocalLockFileAssemblies>
     <PackageId>Flagsmith</PackageId>
     <Title>Flagsmith</Title>
-    <Version>5.4.3</Version>
+    <Version>6.0.0</Version>
     <Authors>flagsmith</Authors>
     <Company>Flagsmith</Company>
     <PackageDescription>Client SDK for Flagsmith. Ship features with confidence using feature flags and remote config. Host yourself or use our hosted version at https://flagsmith.com/</PackageDescription>