Use grunt-webfonts instead of grunt-webfont and disable generation for symbolic linked icons.
grunt-webfont seems unmaintained as the latest release was 2 years ago and the github repository is archived.
This switches the dependency over to grunt-webfonts which is a fork and is actively maintained. It also allows ignoring symbolic links during the font generation which reduces the number of glyphs created from 1821 to 1109.