archlinux: replace gcc12 with gcc11

Author: coderkalyan

docker/Dockerfile_base-archlinux

@@ -29,6 +29,9 @@ RUN pacman -Sy --noconfirm \
 		wget \
 		zip
 
+# Use gcc11 instead of gcc12 for now due to fast-rtps compile error
+RUN pacman -Rns --noconfirm gcc && pacman -Syu --noconfirm gcc11
+
 # Python 3 dependencies installed by pip
 RUN pip3 install argparse argcomplete coverage cerberus empy jinja2 kconfiglib \
 		matplotlib==3.0.* numpy packaging pkgconfig pyros-genmsg pyulog \