Remove faiss from libcuml (rapidsai#5175)

The version of `faiss` that's currently used by `libcuml` conflicts with the version used by `raft`.

After discussions with @dantegd and @cjnolet, it was determined that `cuml` should really just depend on `raft`'s version of `faiss` anyway.

Therefore, this PR removes `faiss` from `libcuml`.

Authors:
  - AJ Schmidt (https://github.com/ajschmidt8)

Approvers:
  - Ray Douglass (https://github.com/raydouglass)

URL: rapidsai#5175

conda/recipes/libcuml/conda_build_config.yaml

@@ -19,9 +19,6 @@ treelite_version:
 gtest_version:
   - "=1.10.0"
 
-libfaiss_version:
-  - "=1.7.2 *_cuda"
-
 # The CTK libraries below are missing from the conda-forge::cudatoolkit
 # package. The "*_host_*" version specifiers correspond to `11.8` packages and the
 # "*_run_*" version specifiers correspond to `11.x` packages.

conda/recipes/libcuml/meta.yaml

@@ -40,7 +40,6 @@ requirements:
   host:
     - cudatoolkit ={{ cuda_version }}
     - cudf ={{ minor_version }}
-    - faiss-proc=*=cuda
     - gmock
     - gtest {{ gtest_version }}
     - lapack
@@ -55,7 +54,6 @@ requirements:
     - libcusolver-dev {{ libcusolver_host_version }}
     - libcusparse {{ libcusparse_host_version }}
     - libcusparse-dev {{ libcusparse_host_version }}
-    - libfaiss {{ libfaiss_version }}
     - libraft-distance ={{ minor_version }}
     - libraft-headers ={{ minor_version }}
     - libraft-nn ={{ minor_version }}
@@ -76,15 +74,13 @@ outputs:
       run:
         - cudatoolkit {{ cuda_spec }}
         - cudf ={{ minor_version }}
-        - faiss-proc=*=cuda
         - libcublas {{ libcublas_run_version }}
         - libcublas-dev {{ libcublas_run_version }}
         - libcufft {{ libcufft_run_version }}
         - libcumlprims ={{ minor_version }}
         - libcurand {{ libcurand_run_version }}
         - libcusparse {{ libcusparse_run_version }}
         - libcusparse-dev {{ libcusparse_run_version }}
-        - libfaiss {{ libfaiss_version }}
         - libraft-distance ={{ minor_version }}
         - libraft-headers ={{ minor_version }}
         - libraft-nn ={{ minor_version }}