bump Janet version to v1.34

[AlecTroemel]

also removed the strict: true from the demo cart, which was incorrectly copy/pasted from the fennel demo cart.

[AlecTroemel]

took a minute to find the actual windows failure, heres the line https://github.com/nesbox/TIC-80/actions/runs/8853673596/job/24315055075?pr=2539#step:4:3165

janet.lib(janet.c.obj) : error LNK2019: unresolved external symbol InterlockedIncrement referenced in function janet_atomic_inc [D:\a\TIC-80\TIC-80\build\cart2prj.vcxproj]

[AlecTroemel]

from what I can tell that InterlockedIncrement function call has been around forever. My gut says this is something off with the build configuration

[nesbox]

we have problem with InterlockedIncrement on windows because ${THIRDPARTY_DIR}/janet/build/c/janet.c doesn't include windows.h
I approve it and later will create a workaround to fix this

[nesbox]

Unfortunately, I wasn't able to fix the Winxp build, a lot of errors.

So I reverted the PR for now to the old Janet version, sorry.

[AlecTroemel]

I'll chat with the Janet community! I don't think we have any sort of automated builds for Windows, especially not windows XP. So there could be a change I just didn't see.

Hopefully I'll be able to reproduce the Janet windows XP build errors independent of tic80

[AlecTroemel]

there are build & test ci/cd jobs for windows, just not windows XP https://github.com/janet-lang/janet/actions/runs/8777715785/job/24083063634?pr=1438

[nesbox]

I'm thinking of reopening PR and trying to fix the build separately