Update Inter to latest version and build italic version

feat: Update Inter to latest version

This allows us to remove the workaround for: https://github.com/rsms/inter/issues/523 and brings a load of updates.

chore: Remove Inter Info around v3.19

feat: Build Italic version of GitLab Sans as well

See: #11 (closed)

chore: Stop building hinted GitLab Mono version