chore: bump github.com/Azure/azure-sdk-for-go/sdk/azcore from 1.14.0 to 1.15.0 in /examples/msal-go in the all group

chore: bump github.com/Azure/azure-sdk-for-go/sdk/azcore from 1.14.0 to 1.15.0 in /examples/msal-go in the all group #1590