Bump src/submodules/MessagePack-CSharp from `1fd19e6` to `6caf299`#6

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dependabot/submodules/release/5.0/src/submodules/MessagePack-CSharp-6caf299ladeak/aspnetcore:dependabot/submodules/release/5.0/src/submodules/MessagePack-CSharp-6caf299Copy head branch name to clipboard