Let administrators upload font files

<?php

add_filter(
	'upload_mimes',
	static function ( $mimes ) {
		if ( current_user_can( 'manage_options' ) ) {
			$mimes['woff2'] = 'font/woff2';
			$mimes['woff']  = 'font/woff';
			$mimes['ttf']   = 'font/ttf';
			$mimes['otf']   = 'font/otf';
		}
		return $mimes;
	}
);

// PHP reports fonts under many types; trust the extension for administrators.
add_filter(
	'wp_check_filetype_and_ext',
	static function ( $data, $file, $filename, $mimes ) {
		if ( ! empty( $data['ext'] ) || ! current_user_can( 'manage_options' ) ) {
			return $data;
		}
		$check = wp_check_filetype( $filename, $mimes );
		if ( in_array( $check['ext'], array( 'woff2', 'woff', 'ttf', 'otf' ), true ) ) {
			$data['ext']  = $check['ext'];
			$data['type'] = $check['type'];
		}
		return $data;
	},
	10,
	4
);