Upgrade API version for azurerm_mysql_flexible_server

[neil-yechenwei]

Service team released a new stable API version 2021-05-01 for MySql Flexible Server. So submitted this PR to update the API version to stable one. Service team confirmed the contents among two versions are same.

--- PASS: TestAccMySqlFlexibleServer_basic (604.64s)
--- PASS: TestAccMySqlFlexibleServer_updateStorage (975.47s)
--- PASS: TestAccMySqlFlexibleServer_updateMaintenanceWindow (1003.09s)
--- PASS: TestAccMySqlFlexibleServer_requiresImport (554.62s)
--- PASS: TestAccMySqlFlexibleServer_complete (1669.00s)
--- PASS: TestAccMySqlFlexibleServer_failover (1676.24s)
--- PASS: TestAccMySqlFlexibleServer_updateSku (1679.46s)
--- PASS: TestAccMySqlFlexibleServer_pitr (2225.32s)
--- PASS: TestAccMySqlFlexibleServer_geoRestore (2270.78s)
--- PASS: TestAccMySqlFlexibleServer_replica (2453.04s)
--- PASS: TestAccMySqlFlexibleServer_updateReplicationRole (2820.29s)
--- PASS: TestAccMySqlFlexibleServer_completeUpdate (2278.14s)
--- PASS: TestAccMySqlFlexibleServer_updateHA (3503.92s)

[katbyte]

Thanks @neil-yechenwei - aside from the merge conflict to resolve this LGTM me 🏗️

[neil-yechenwei]

@katbyte , I found a check failure. I fixed in PR. Please take a look. Thanks.

[github-actions]

This functionality has been released in v2.83.0 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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