Fix some g-i and compilation warnings
vulkan: Fix some doc strings and also some g-i warnings
meson: Update openjpeg wrap to 2.5.2, fixes a warning
The version was incorrectly encoded in the opj_config.h header with
the earlier version, which caused a compilation warning.
../subprojects/gst-plugins-bad/ext/openjpeg/gstopenjpegenc.c:943:5: warning: ‘bpp’ is deprecated:
Use prec instead [-Wdeprecated-declarations]
943 | comps[i].bpp = GST_VIDEO_FRAME_COMP_DEPTH (frame, i);
| ^~~~~