[wip] Fix robot PageConfig parsing, upgrading isort, pin jedi

[bollwyvl]

Sorry this kinda ended up as a mess (should have been a one-character PR, ha), but i had to rebuild my env, and some things were going a bit wacky. This has me running all the way to failing some acceptance tests for other reasons, but figured it was worth getting out, if only for cherry-picking the good parts.

References

• fixes All robot CI tests are failing, possibly due to a string in notebook version specs #444

Code changes

• fix robot parsing of JSON which might contain single \ escapes
• upgrade isort
• pin jedi
• get isort and and all the fixings from conda-forge only with nodefaults instead of defaults

User-facing changes

n/a

Backwards-incompatible changes

n/a

Chores

• linted
• tested
• documented
• changelog entry

[krassowski]

Thank you!

[bollwyvl]

Hooray! Lmk if I can help you on anything else! Is really love to drive towards a release for lab 3 with the kernel... Haven't taken a look at that pr in a spell however. Also no movement on the metals stuff... Coursier is weird.

[krassowski]

Hoping to do a final bugfix release for 2.2 today and start looking into 3.0 in the new year.