Bump tensorflow-gpu from 2.4.0 to 2.6.4 in /python-ff#233

dependabot[bot] wants to merge 1 commit intomasterlablup/backend.ai-kernels:masterfrom

dependabot/pip/python-ff/tensorflow-gpu-2.6.4lablup/backend.ai-kernels:dependabot/pip/python-ff/tensorflow-gpu-2.6.4Copy head branch name to clipboard