Deploy: Pin poetry version to 1.0

It looks like more recent versions of poetry do not handle well nested
local package deps.
https://github.com/python-poetry/poetry/issues/3098

docker/3_buildwheels/build.sh

@@ -33,7 +33,10 @@ docker run --rm -i \
     -v "$TOPDEVDIR:/data/topdev" \
     $DOCKER_IMAGE_NAME <<EOT
 set -e
-pip3 install wheel poetry
+
+# Pin poetry to 1.0, as more recent version to not support nested filesystem package
+# dependencies.
+pip3 install wheel poetry==1.0
 
 # Build wheels for all dependencies.
 cd /data/topdev/blender-cloud