update submodule
msOGRFileClose: drop useless OGR mutex that could cause a dead-lock with tileindex (#4869)
Fix blending of semi-opaque pixels in average and bilinear resamplers (#4875)
Restore lexer file pointer on INCLUDE error (#4871)
Switch off ogr-output streaming mode for non default io contexts (#4858)
Merge branch 'branch-6-4'

Conflicts:
	mapio.h
	maplexer.c
	mapresample.c
	msautotest
update submodule
update submodule after 6.4 merge