Update ipykernel requirement from ~=5.3 to ~=6.15

[dependabot[bot]]

Updates the requirements on [ipykernel]() to permit the latest version.

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[codecov[bot]]

Codecov Report

Merging #297 (bc7e59d) into master (c26c1f4) will decrease coverage by 6.56%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #297      +/-   ##
==========================================
- Coverage   37.22%   30.66%   -6.57%     
==========================================
  Files          25       27       +2     
  Lines        3823     5078    +1255     
==========================================
+ Hits         1423     1557     +134     
- Misses       2400     3521    +1121     

Impacted Files	Coverage Δ
src/utils.rs	65.78% <0.00%> (-34.22%)	:arrow_down:
src/error.rs	19.54% <0.00%> (-18.24%)	:arrow_down:
src/lib.rs	9.66% <0.00%> (ø)
src/macros.rs	0.00% <0.00%> (ø)
src/py/term/clause.rs	34.03% <0.00%> (+0.16%)	:arrow_up:

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[dependabot[bot]]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.