Pin armadillo in 4.0 (#3652)

* Update meta.yaml to rename conda package to isis from isis3 (#3642)

* Pin armadillo in meta.yaml (#3650)

* Update meta.yaml to rename conda package to isis from isis3

* Pin anaconda to version 9.0 in meta.yaml so it will run without a missing shared libraries error.

* Actually pin armadillo to version 8.200.0 because 9 isn't needed and we know 8.200.0 works.