[3.13] community/go: upgrade to 1.15.7

• main/util-linux: unbreak user mounts
• main/musl: upgrade to 1.2.2
• community/kea: fix install location of kea-admin scripts
• community/grpc: upgrade to 1.34.1
• community/s6-overlay-preinit: rebuild for skalibs ABI change
• main/bonding: add support for bond-members statements
• testing/py3-rich: new aport
• community/py3-rich: move from testing
• community/ansible-lint: add missing dependecy on py3-rich
• community/justc-envdir: fix build with new skalibs
• community/nextcloud19: upgrade to 19.0.7
• community/nextcloud19: bump for checksums
• community/py3-fs: upgrade to 2.4.12
• testing/py3-intervals: upgrade to 0.9.1
• main/btrfs-progs: upgrade to 5.10
• main/gptfdisk: security upgrade to 1.0.6
• main/dnsmasq: security upgrade to 2.83
• community/go: upgrade to 1.15.7