[data] Revert: Update base-build to build python-3.7 packages [ci skip]

bob/devtools/data/gitlab-ci/base-build.yaml

@@ -22,7 +22,7 @@ stages:
     - source ${CONDA_ROOT}/etc/profile.d/conda.sh
     - conda activate base
     - bdt ci base-build -vv nopython.txt
-    - bdt ci base-build -vv --python=3.6 --python=3.7 python.txt
+    - bdt ci base-build -vv --python=3.6 python.txt
     - '[ "${CI_COMMIT_REF_NAME}" = "master" ] && bdt ci base-deploy -vv'
     - bdt ci clean -vv
   cache: &build_caches