Revert "CI: fix conda version (#19025)" (#19062)

This reverts commit c19bdc9.

Author: jreback

ci/install_travis.sh

@@ -48,12 +48,7 @@ echo
 echo "[update conda]"
 conda config --set ssl_verify false || exit 1
 conda config --set quiet true --set always_yes true --set changeps1 false || exit 1
-
-# TODO(jreback), fix conoda version
-echo
-echo "[conda version]"
-conda install conda=4.4.4
-# conda update -q conda
+conda update -q conda
 
 if [ "$CONDA_BUILD_TEST" ]; then
     echo