[csharp/Tests] Update mcr.microsoft.com/devcontainers/dotnet Docker t… #1007

Job	Run time
Find all Bootstraps with a devcontainer spec	2s
Validate Bootstrap clojure	20s
Validate Bootstrap csharp	32s
Validate Bootstrap denojs	18s
Validate Bootstrap elixir	56s
Validate Bootstrap elm	37s
Validate Bootstrap fsharp	35s
Validate Bootstrap gleam	31s
Validate Bootstrap golang	47s
Validate Bootstrap haskell	1m 38s
Validate Bootstrap java	24s
Validate Bootstrap kotlin	47s
Validate Bootstrap nodejs	42s
Validate Bootstrap php	21s
Validate Bootstrap purescript	54s
Validate Bootstrap python	35s
Validate Bootstrap rescript	38s
Validate Bootstrap ruby	38s
Validate Bootstrap rust	38s
Validate Bootstrap scala2	47s
Validate Bootstrap scala3	51s
Validate Bootstrap typescript	37s
Validate Bootstrap zig	41s
	14m 49s

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