Release the latest versions

• v3.12.3 (x86_64 & aarch64)
• v3.11.7 (x86_64)
• v3.10.5-r1 (x86_64)
• today's edge (x86_64 & aarch64)

builder.py timings, roughly

• amis - 23m
• release (serial) - 1h38m
• refresh-releases - 4m
• gen-release-readme - instantaneous