Update jimtcl

[EvanTheB]

Jimtcl has a new home: https://github.com/msteveb/jimtcl

And recently fixed the whitespace compilation issue: msteveb/jimtcl@bcd4434

[lurch]

Yes, the whitespace issue got fixed thanks to me reporting it 😃

I've been planning to bump the version of jimtcl used in this repo, but before I can do that I need to check that openocd, VSCode and picoprobe all still work properly, and unfortunately I've not had time to do that yet... 🙁

[lurch]

(@aallan please feel free to assign this issue to me)

[lurch]

@EvanTheB I assume that this issue is now redundant? (gosh, 3 years old!)