Use conda mambabuild not mamba mambabuild (#1338)

With the release of conda 23.7.3, mamba's mambabuild stopped working. With boa installed, `conda mambabuild` uses the mamba solver, so just use that instead.

See also rapidsai/cudf#14068.

Authors:
  - Lawrence Mitchell (https://github.com/wence-)

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

URL: #1338

ci/build_cpp.sh

@@ -11,6 +11,7 @@ rapids-print-env
 
 rapids-logger "Begin cpp build"
 
-rapids-mamba-retry mambabuild conda/recipes/librmm
+# This calls mambabuild when boa is installed (as is the case in the CI images)
+rapids-conda-retry mambabuild conda/recipes/librmm
 
 rapids-upload-conda-to-s3 cpp

ci/build_python.sh

@@ -13,6 +13,7 @@ rapids-logger "Begin py build"
 
 CPP_CHANNEL=$(rapids-download-conda-from-s3 cpp)
 
-rapids-mamba-retry mambabuild -c "${CPP_CHANNEL}" conda/recipes/rmm
+# This calls mambabuild when boa is installed (as is the case in the CI images)
+rapids-conda-retry mambabuild -c "${CPP_CHANNEL}" conda/recipes/rmm
 
 rapids-upload-conda-to-s3 python