shards: 0.15 → 0.16

[fabianhjr]

Motivation for this change

Continuation of #141572 (Crystal 1.0.0 → 1.2.0)

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandbox = true set in nix.conf? (See Nix manual)
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• 21.11 Release Notes (or backporting 21.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

[github-actions]

Backport failed for release-21.05, because it was unable to cherry-pick the commit(s).

Please cherry-pick the changes locally.

git fetch origin release-21.05
git worktree add -d .worktree/backport-141662-to-release-21.05 origin/release-21.05
cd .worktree/backport-141662-to-release-21.05
git checkout -b backport-141662-to-release-21.05
ancref=$(git merge-base c254c77513d68256f22014c733d937a5d7554f7d 4e2085f338e183ca0e24a3d13308bf9ffaf15532)
git cherry-pick -x $ancref..4e2085f338e183ca0e24a3d13308bf9ffaf15532