Revert Open3D to 0.11.2

This change fixes a dependency conflict that causes a very old version
of Jinja2 to be installed (see cvat-ai#4618). Open3D is only used for PCD
conversion, so this reverting to an older version is acceptable.

This is a temporary workaround. As a future update we'd like to get rid
of the Open3D dependency, since it pulls in a bunch of unnecessary
dependencies. Also, we'd like to make python dependency resolution more
robust by pinning all (recursive) dependencies to specific versions with
a tool like pip-tools or poetry.

cvat/requirements/base.txt

@@ -42,7 +42,7 @@ tensorflow==2.8.0 # Optional requirement of Datumaro. Use tensorflow-macos==2.8.
 # archives. Don't use as a python module because it has GPL license.
 patool==1.12
 diskcache==5.0.2
-open3d==0.14.1
+open3d==0.11.2
 boto3==1.17.61
 azure-storage-blob==12.8.1
 google-cloud-storage==1.42.0