Unclosed file streams in UpdateCheck

[catilac]

[[Reserved for Mark Sherman's Class]]

In https://github.com/processing/processing4/blob/main/app/src/processing/app/UpdateCheck.java#L207-L213

We are creating streams, but not closing those streams. On success, or on exception (!), those resources are never freed.

Please free them.

[srnkan]

I'll take a look