Some of the base images fail to build

[marjo-luc]

The r, vanilla, and isce2 base images have been failing to build for ~1 week. All fail with an error message similar to this:
File "/opt/conda/lib/python3.9/site-packages/OpenSSL/__init__.py", line 8, in <module> from OpenSSL import crypto, SSL File "/opt/conda/lib/python3.9/site-packages/OpenSSL/crypto.py", line 1556, in <module> class X509StoreFlags(object): File "/opt/conda/lib/python3.9/site-packages/OpenSSL/crypto.py", line 1577, in X509StoreFlags CB_ISSUER_CHECK = _lib.X509_V_FLAG_CB_ISSUER_CHECK AttributeError: module 'lib' has no attribute 'X509_V_FLAG_CB_ISSUER_CHECK'

[marjo-luc]

I updated the base image image from continuumio/miniconda3:4.10.3p1 to continuumio/miniconda3:4.12.0 for r, vanilla, plant, rsgislib, and isce2 on DIT. All images now build successfully except r, which fails with the following message:

ImportError: cannot import name 'KernelManager' from 'jupyter_client'

[gchang]

r image still fails

[marjo-luc]

@bsatoriu @anilnatha

[gchang]

Migrating this to #684 since we have to rebuild the r image anyway.