fix: fix build pipeline error (#38)

## Description

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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)

Reviewed-on: #38
Co-authored-by: Marcel S. Henselin <marcel.henselin@stackit.cloud>
Co-committed-by: Marcel S. Henselin <marcel.henselin@stackit.cloud>

stackit/internal/services/postgresflexalpha/database/functions.go

@@ -59,7 +59,7 @@ func getDatabase(
 
 	for page := int32(1); ; page++ {
 		res, err := client.ListDatabasesRequest(ctx, projectId, region, instanceId).
-			Page(page).Size(pageSize).Sort(postgresflex.DATABASESORT_INDEX_ASC).Execute()
+			Page(page).Size(pageSize).Sort(postgresflex.DATABASESORT_DATABASE_ID_ASC).Execute()
 		if err != nil {
 			return nil, fmt.Errorf("requesting database list (page %d): %w", page, err)
 		}

stackit/internal/services/postgresflexalpha/flavor/functions.go

@@ -44,7 +44,7 @@ func getFlavorsByFilter(
 
 	for page := int32(1); ; page++ {
 		res, err := client.GetFlavorsRequest(ctx, projectId, region).
-			Page(page).Size(pageSize).Sort(postgresflex.FLAVORSORT_INDEX_ASC).Execute()
+			Page(page).Size(pageSize).Sort(postgresflex.FLAVORSORT_ID_ASC).Execute()
 		if err != nil {
 			return nil, fmt.Errorf("requesting flavors list (page %d): %w", page, err)
 		}