Update to mamba 1.5.7

Author: SylvainCorlay

repo2docker/buildpacks/conda/install-base-env.bash

@@ -5,7 +5,7 @@ set -ex
 
 cd $(dirname $0)
 
-export MAMBA_VERSION=1.5.1
+export MAMBA_VERSION=1.5.7
 export CONDA_VERSION=23.7.4
 
 URL="https://anaconda.org/conda-forge/micromamba/${MAMBA_VERSION}/download/${CONDA_PLATFORM}/micromamba-${MAMBA_VERSION}-0.tar.bz2"

tests/conda/py35-binder-dir/verify

@@ -16,12 +16,12 @@ v = out.split()[1]
 assert v[:3] == "3.5", out
 
 out = sh(["micromamba", "--version"])
-assert out == "1.5.1", out
+assert out == "1.5.7", out
 
 out = sh(["mamba", "--version"])
 assert (
     out
-    == """mamba 1.5.1
+    == """mamba 1.5.7
 conda 23.7.4"""
 ), out