The '[Download Diagram]' links only return a 404 due to master -> main renaming

As far as I can judge, it's because the branch was renamed from master to main:

does NOT work:

https://gitlab.com/redhatdemocentral/portfolio-architecture-examples/-/raw/master/diagrams/detailed-diagrams-omnichannel-customer-experience.drawio?inline=false

Works:

https://gitlab.com/redhatdemocentral/portfolio-architecture-examples/-/raw/main/diagrams/detailed-diagrams-omnichannel-customer-experience.drawio