chore: bump dotnet/sdk from 6.0 to 7.0 in /examples/azure-identity/do…

…tnet (#872)

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examples/azure-identity/dotnet/Dockerfile

@@ -1,4 +1,4 @@
-FROM --platform=linux/amd64 mcr.microsoft.com/dotnet/sdk:6.0 AS builder
+FROM --platform=linux/amd64 mcr.microsoft.com/dotnet/sdk:7.0 AS builder
 WORKDIR /app
 ADD . .
 RUN dotnet build akvdotnet.csproj && dotnet publish -c release