bump cxxopts to 3.3.1 - #56

No cached files found at path "/home/runner/work/font-maker/font-maker/emsdk-cache" - downloading and caching emsdk.

Failed to save: <h2>Our services aren't available right now</h2><p>We're working to restore all services as soon as possible. Please check back soon.</p>0XbGEaQAAAACxzHr20hFYQI3Aey5TRKEtRE0yRURHRTAxMTYARWRnZQ==

The parameter 'arch' was specified, which doesn't have any effect on this boost version

Failed to restore: Cache service responded with 400