Bump conda from 24.11.0 to 25.7.0

Bumps [conda](https://github.com/conda/conda) from 24.11.0 to 25.7.0
- [Release notes](https://github.com/conda/conda/releases)
- [Commits](https://github.com/conda/conda/compare/24.11.0...25.7.0)

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

@@ -6,7 +6,7 @@ set -ex
 cd $(dirname $0)
 
 export MAMBA_VERSION="2.3.2"
-export CONDA_VERSION=24.11.0
+export CONDA_VERSION="25.7.0"
 
 URL="https://anaconda.org/conda-forge/micromamba/${MAMBA_VERSION}/download/${CONDA_PLATFORM}/micromamba-${MAMBA_VERSION}-0.tar.bz2"