remove Scaleway labs from list of providers

The service has been discontinued:
https://labs.scaleway.com/en/ipfs-pinning/#the-end

Author: volkyeth

docs/how-to/work-with-pinning-services.md

@@ -46,7 +46,6 @@ Third-party pinning services allow you to purchase pinning capacity for importan
 - [Filebase](https://filebase.com/)
 - [Storacha (formerly web3.storage)](https://storacha.network/)
 - [Infura](https://infura.io/)
-- [Scaleway](https://labs.scaleway.com/en/ipfs-pinning/)
 
 ::: callout 
 As of June 2023, [Filebase](https://filebase.com) and [Pinata](https://pinata.cloud/) support the [IPFS Pinning Service API endpoint](https://github.com/ipfs/pinning-services-api-spec).