sysutils/conky: update to 1.21.5
ChangeLog: https://github.com/brndnmtthws/conky/releases/tag/v1.21.5
Features
- Made upspeedgraph and downspeed graph scale on a common axis
Bug fixes
- Fix invalid uniform vector init function in geometry
- Fix for GCC 15 two-phase lookup
- Fixed graph parsing error
Miscellaneous
- Bump version
- build(deps): bump DeterminateSystems/nix-installer-action from 12 to 13 in the actions group