ci: Use bookworm for online builds
PureOS carries rather old versions of rustc and cargo. Attempting to build fails at transitive dependencies, and it's easier to upgrade the compiler than to track down and hold offending depencencies as they come.
PureOS carries rather old versions of rustc and cargo. Attempting to build fails at transitive dependencies, and it's easier to upgrade the compiler than to track down and hold offending depencencies as they come.