- Replace ctags hard requirement with a recommendation for
libsource-highlight, fixes bsc#1193401
- Run spec-cleaner

- Add GCC 11 compatibility fix:
* 0001-Remove-throw-specifications.patch
- Update source-highlight-doxygen_disable_timestamp_in_footer.patch
to allow using %autosetup

- Do not use keyring for now as key signing key is not properly
published
- Modernise spec-file and simplify depenency conditionals

- restore keyring as sig is available from upstream

- update to 3.1.9:
* changed esc.style to work better with dark theme terminals
* updated C and C++ to more recent standards
* fixed zsh.lang
* added new Python keywords
* added Rust
* added ixpe
* added vim
- remove keyring as sig no longer is available