Add miniconda2 4.5.12, remove miniconda2 4.5.11

for stack(s) cflinuxfs2, cflinuxfs3 [#162914581]

Author: cf-buildpacks-eng

manifest.yml

@@ -36,12 +36,13 @@ dependencies:
   uri: https://buildpacks.cloudfoundry.org/dependencies/manual-binaries/python/libmemcache-1.0.18-linux-x64-6d33aa02.tgz
   sha256: '009a3476197030e30d0ce924cc044ee4851ef27324e132b29fd12d8cde071915'
 - name: miniconda2
-  version: 4.5.11
-  uri: https://repo.continuum.io/miniconda/Miniconda2-4.5.11-Linux-x86_64.sh
-  sha256: 0e23e8d0a1a14445f78960a66b363b464b889ee3b0e3f275b7ffb836df1cb0c6
+  version: 4.5.12
+  uri: https://repo.continuum.io/miniconda/Miniconda2-4.5.12-Linux-x86_64.sh
+  sha256: bb03ebb9057b0ffcdd5b0192ef44b4c414a5cc25e05d3f319b66e44d2a3b0146
   cf_stacks:
   - cflinuxfs2
   - cflinuxfs3
+  source: https://github.com/conda/conda/archive/4.5.12.tar.gz
 - name: miniconda3
   version: 4.5.11
   uri: https://repo.continuum.io/miniconda/Miniconda3-4.5.11-Linux-x86_64.sh