r/storage_account: making the resource group name case sensitive

[tombuildsstuff]

Noticed whilst passing through this was case insensitive when it shouldn't be (afaik) - running the tests (with the changes from #5270) the basic test passes:

$ TF_ACC=1 envchain azurerm go test -v ./azurerm/internal/services/storage/tests/ -run=TestAccAzureRMStorageAccount_basic
=== RUN   TestAccAzureRMStorageAccount_basic
=== PAUSE TestAccAzureRMStorageAccount_basic
=== CONT  TestAccAzureRMStorageAccount_basic
--- PASS: TestAccAzureRMStorageAccount_basic (490.60s)
PASS
ok  	github.com/terraform-providers/terraform-provider-azurerm/azurerm/internal/services/storage/tests	490.642s

[katbyte]

LGTM 👍

[tombuildsstuff]

Ignoring an unrelated test failure (which'll be fixed in a separate PR) the tests for this look good:

[ghost]

This has been released in version 1.40.0 of the provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading. As an example:

provider "azurerm" {
    version = "~> 1.40.0"
}
# ... other configuration ...

[ghost]

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