fix: fix sqlserverflexalpha (#61)

## 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: #61
Co-authored-by: Marcel S. Henselin <marcel.henselin@stackit.cloud>
Co-committed-by: Marcel S. Henselin <marcel.henselin@stackit.cloud>

go.sum

@@ -174,8 +174,6 @@ github.com/stackitcloud/stackit-sdk-go/core v0.21.0 h1:QXZqiaO7U/4IpTkJfzt4dt6Qx
 github.com/stackitcloud/stackit-sdk-go/core v0.21.0/go.mod h1:fqto7M82ynGhEnpZU6VkQKYWYoFG5goC076JWXTUPRQ=
 github.com/stackitcloud/stackit-sdk-go/services/iaasalpha v0.1.23-alpha h1:ugpMOMUZGB0yXsWcfe97F7GCdjlexbjFuGD8ZeyMSts=
 github.com/stackitcloud/stackit-sdk-go/services/iaasalpha v0.1.23-alpha/go.mod h1:v5VGvTxLcCdJJmblbhqYalt/MFHcElDfYoy15CMhaWs=
-github.com/stackitcloud/stackit-sdk-go/services/sqlserverflex v1.4.1 h1:6MJdy1xmdE+uOo/F8mR5HSldjPSHpdhwuqS3u9m2EWQ=
-github.com/stackitcloud/stackit-sdk-go/services/sqlserverflex v1.4.1/go.mod h1:XLr3ZfrT1g8ZZMm7A6RXOPBuhBkikdUN2o/+/Y+Hu+g=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.7.2/go.mod h1:R6va5+xMeoiuVRoj+gSkQ7d3FALtqAAGI1FQKckRals=
 github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=