AMG: fix a casing of the SKU name

[yugangw-msft]

General Guidelines

• Have you run azdev style <YOUR_EXT> locally? (pip install azdev required)
• Have you run python scripts/ci/test_index.py -q locally?

For new extensions:

• My extension description/summary conforms to the Extension Summary Guidelines.

[yugangw-msft]

@kairu-ms, would appreciate a quick review to public a new version so CLI can keeping on working with the latest service bit

[yonzhan]

@kairu-ms for awareness