[ci] fix horovod master test (#46602)

Another place to fix horovod release test

Test:
- CI

Signed-off-by: can <can@anyscale.com>

release/ray_release/byod/byod_horovod_master_test.sh

@@ -5,3 +5,8 @@
 set -exo pipefail
 
 HOROVOD_WITH_GLOO=1 HOROVOD_WITHOUT_MPI=1 HOROVOD_WITHOUT_TENSORFLOW=1 HOROVOD_WITHOUT_MXNET=1 HOROVOD_WITH_PYTORCH=1 pip3 install -U git+https://github.com/horovod/horovod.git
+
+# Required because horovod is compiled from source on this image, which has
+# a higher version of libstdc++, not compatible with the conda environment.
+ln -sf /usr/lib/gcc/x86_64-linux-gnu/11/libstdc++.so /home/ray/anaconda3/lib/libstdc++.so
+ln -sf /usr/lib/gcc/x86_64-linux-gnu/11/libstdc++.so /home/ray/anaconda3/lib/libstdc++.so.6