Update dependencies in CircleCI build

[sgerrand]

💁 Updates the version of

• Leiningen
• Confluent Platform components

in the CircleCI build configuration.

[codecov[bot]]

Codecov Report

Merging #217 into master will decrease coverage by 0.38%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #217      +/-   ##
==========================================
- Coverage   79.78%   79.39%   -0.39%     
==========================================
  Files          42       42              
  Lines        2572     2572              
  Branches      150      150              
==========================================
- Hits         2052     2042      -10     
- Misses        370      380      +10     
  Partials      150      150

Impacted Files	Coverage Δ
src/jackdaw/serdes/edn2.clj	45.45% <0%> (-45.46%)	:arrow_down:

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[cddr]

Thanks @sgerrand. Might also be worth putting a link to the kafka upgrade documentation in the Changelog entry for this PR.

https://kafka.apache.org/23/documentation.html#upgrade_230_notable

[sgerrand]

@cddr Updated! ♻️

[sgerrand]

@cddr and again. ♻️