chore(deps): update mcr.microsoft.com/dotnet/sdk docker tag to v8

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
mcr.microsoft.com/dotnet/sdk	final	major	6.0 -> 8.0
mcr.microsoft.com/dotnet/sdk	docker	major	6.0 -> 8.0

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