synapse: Upgrade API to 2021-03-01 and add data_exfiltration_protection_enabled argument

[favoretti]

$ TF_ACC=1 go test -v ./azurerm/internal/services/synapse -timeout=1000m -run='TestAccSynapseWorkspace_complete'
2021/06/11 14:13:02 [DEBUG] not using binary driver name, it's no longer needed
2021/06/11 14:13:03 [DEBUG] not using binary driver name, it's no longer needed
=== RUN   TestAccSynapseWorkspace_complete
=== PAUSE TestAccSynapseWorkspace_complete
=== CONT  TestAccSynapseWorkspace_complete
--- PASS: TestAccSynapseWorkspace_complete (1106.80s)
PASS
ok  	github.com/terraform-providers/terraform-provider-azurerm/azurerm/internal/services/synapse	1109.410s

Fixes #12182

[favoretti]

[favoretti]

[github-actions]

This functionality has been released in v2.64.0 of the Terraform Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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