[cocci] Coccinelle 1.3.1 release

Hi everyone,

We are releasing Coccinelle 1.3.1, which adds support for scoped_guard 
and compatibility for OCaml 5.2 and 5.3.

Here is the changelog:

Language:
- Add support for scoped_guard
- Add support for C++'s typename construct
Features:
- Officially supported OCaml versions are now 4.11.0-5.3.0
- Various pretty printing improvements
- Flatpak builds are now available (locally or via Flathub)
Bugfixes:
- Fix crash caused by unmatched parentheses in #define blocks
- Exclude .in.h and .in.c files from inclusion

Thanks to everyone who contributed!
Victor