build: Bump CI image and libadwaita versions for 46 development cycle
We are likely to need libadwaita 1.4 during this cycle (for example, for #2245 (closed)). The CI images were also using older OS releases, and we can now use newer ones for development and new shininess.
So, bump to Fedora 38 and Debian Trixie (currently Debian Testing).
Rationale: !1761 (comment 1868232)
Signed-off-by: Philip Withnall pwithnall@endlessos.org
Helps: !1761 (merged)