Log Message:
graphics/gource: Update to 0.55

Changelog:
0.55:
    Fixed build with Boost 1.85.0 (cho-m).

0.54:
    Added experimental support for Wayland (beroset).
    Fixed building on Apple M1 by updating autoconf macros (Ckhardin).

0.53:
    Add --high-dpi option.
    Fixed various bugs with Retina displays on MacOS.
    Fixed slider timestamp font not affected by --font-scale.
    Fixed hovering over end of slider stopping time advancing.

0.52:
    Support rendering at native resolution on Retina / Ultra HD displays.
    Support ISO 8601 timestamp format.
    Allow custom log and caption file timestamps to be strings.
    Change regular expression library to PCRE2.
    Fixed filenames not being affected by --font-scale (Carl Colena).
    Fixed file key not being affected by --font-scale.
    Added --file-idle-time-at-end option.
    Added --fixed-user-size option.