fix: builder and sdk changes (#81)

## Description

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At least please give us some description what you are trying to achieve and why your change is needed. -->

relates to #1234

## Checklist

- [ ] Issue was linked above
- [ ] Code format was applied: `make fmt`
- [ ] Examples were added / adjusted (see `examples/` directory)
- [x] Docs are up-to-date: `make generate-docs` (will be checked by CI)
- [ ] Unit tests got implemented or updated
- [ ] Acceptance tests got implemented or updated (see e.g. [here](f5f99d1709/stackit/internal/services/dns/dns_acc_test.go))
- [x] Unit tests are passing: `make test` (will be checked by CI)
- [x] No linter issues: `make lint` (will be checked by CI)

Co-authored-by: Marcel S. Henselin <marcel.henselin@stackit.cloud>
Co-authored-by: marcel.henselin <marcel.henselin@stackit.cloud>
Reviewed-on: #81

stackit/internal/services/sqlserverflexbeta/instance/datasource.go

@@ -14,7 +14,7 @@ import (
 	"tf-provider.git.onstackit.cloud/stackit-dev-tools/terraform-provider-stackitprivatepreview/stackit/internal/core"
 	"tf-provider.git.onstackit.cloud/stackit-dev-tools/terraform-provider-stackitprivatepreview/stackit/internal/utils"
 
-	sqlserverflexbetaPkg "tf-provider.git.onstackit.cloud/stackit-dev-tools/terraform-provider-stackitprivatepreview/pkg_gen/sqlserverflexbeta"
+	"github.com/stackitcloud/stackit-sdk-go/services/sqlserverflex/v3beta1api"
 
 	sqlserverflexbetaGen "tf-provider.git.onstackit.cloud/stackit-dev-tools/terraform-provider-stackitprivatepreview/stackit/internal/services/sqlserverflexbeta/instance/datasources_gen"
 )
@@ -34,7 +34,7 @@ type dataSourceModel struct {
 }
 
 type instanceDataSource struct {
-	client       *sqlserverflexbetaPkg.APIClient
+	client       *v3beta1api.APIClient
 	providerData core.ProviderData
 }
 
@@ -77,7 +77,7 @@ func (d *instanceDataSource) Configure(
 			config.WithRegion(d.providerData.GetRegion()),
 		)
 	}
-	apiClient, err := sqlserverflexbetaPkg.NewAPIClient(apiClientConfigOptions...)
+	apiClient, err := v3beta1api.NewAPIClient(apiClientConfigOptions...)
 	if err != nil {
 		resp.Diagnostics.AddError(
 			"Error configuring API client",
@@ -112,7 +112,7 @@ func (d *instanceDataSource) Read(ctx context.Context, req datasource.ReadReques
 	ctx = tflog.SetField(ctx, "region", region)
 	ctx = tflog.SetField(ctx, "instance_id", instanceId)
 
-	instanceResp, err := d.client.GetInstanceRequest(ctx, projectId, region, instanceId).Execute()
+	instanceResp, err := d.client.DefaultAPI.GetInstanceRequest(ctx, projectId, region, instanceId).Execute()
 	if err != nil {
 		utils.LogError(
 			ctx,