graphics/proj: Update to 7.1.1

• Add a pkg-message explaining how to access or sync datum grids from the CDN (disabled by default)
• Add curl and tiff dependencies since proj can read datum grids from remote COG (Cloud Optimized Geotiff)
• Take maintainer'ship (ok wen@)

PR: 245611
Submitted by: wen (first version)
Reviewed by: wen, rhurlin
Approved by: wen
Exp-run by: antoine