Bump matplotlib from 3.4.3 to 3.7.1#55

dependabot[bot] wants to merge 1 commit intomasterzhengzh/PythonRobotics:masterfrom

dependabot/pip/matplotlib-3.7.1zhengzh/PythonRobotics:dependabot/pip/matplotlib-3.7.1Copy head branch name to clipboard