Revert "update fl container's sha256 in bazelrc"
Revert "update fl container's sha256 in bazelrc"

* The FL container was not with python3.6 installed.

This reverts commit 970b070066c6bc49cac32387163543fe8704bb3f.

Change-Id: I506ab46fc7c53006d75e7369854dd5f2d1c0fcba

bazelbuild/bazel-toolchains