Update .NET SDK version from 5.0.100-preview.5.20279.10 to 5.0.100-preview.6.20318.15 - #13018

Update .NET SDK version from 5.0.100-preview.5.20279.10 to 5.0.100-preview.6.20318.15#13018

Aditya Patwardhan (adityapatwardhan) merged 3 commits into

PowerShell:masterPowerShell/PowerShell:masterfrom

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