Update kde content snap version and update regex to reflect change.

[ScarlettGatelyMoore]

• [ x] Have you followed the guidelines for contributing?
• [x ] Have you signed the CLA?
• Have you successfully run make lint?
• Have you successfully run pytest tests/unit?

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[sergiusens]

looks good, run black to reformat and get rid of the linter errors

[ScarlettGatelyMoore]

Linters and spread tests fixed, I also had to make a few changes as noted in the commit messages. The last few failing spread tests I can't sort out and seem unrelated ? Please let me know. Thank you

[codecov-commenter]

Codecov Report

Merging #4069 (3c81696) into main (71ed1a3) will not change coverage.
The diff coverage is 100.00%.

📣 This organization is not using Codecov’s GitHub App Integration. We recommend you install it so Codecov can continue to function properly for your repositories. Learn more

@@           Coverage Diff           @@
##             main    #4069   +/-   ##
=======================================
  Coverage   94.61%   94.61%           
=======================================
  Files         641      641           
  Lines       51903    51903           
=======================================
  Hits        49107    49107           
  Misses       2796     2796           

Impacted Files	Coverage Δ
tests/unit/extensions/test_kde_neon.py	100.00% <ø> (ø)
snapcraft/extensions/kde_neon.py	100.00% <100.00%> (ø)

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[ScarlettGatelyMoore]

Linters and spread tests fixed, I also had to make a few changes as noted in the commit messages. The last few failing spread tests I can't sort out and seem unrelated ? Please let me know. Thank you

looks good, run black to reformat and get rid of the linter errors

Ok, all tests now pass.