font-iosevka: update to 5.2.1

[folliehiyuki]

General

• This is a new package and it conforms to the quality requirements

Have the results of the proposed changes been tested?

• I use the packages affected by the proposed changes on a regular basis and confirm this PR works for me
• I generally don't use the affected packages but briefly tested this PR

[folliehiyuki]

I was late :(
But on second thought should we move to use super-ttc instead? It contains more variants, spacings while remaining roughly the same file size

[folliehiyuki]

@ericonr the author recommends super-ttc as well

[ericonr]

Oops :p

Feel free to open a PR for an improvement to the package. Do show the current package size and the new package size to help with the decision. That said, given that using a system package requires no manual management, I'm not sure it helps that much.

[folliehiyuki]

Roughly 3MB smaller, worth it?

[ericonr]

Assuming all our packages support the format, sure.