Cleanup after factoring out of Seaside-Squeak-Development

[marschall]

• fix version deprecation in Pharo 14
• use #upTime method
• remove Squeak branch in walkback
• remove Squeak branch in development

[codecov]

Codecov Report

❌ Patch coverage is 5.26316% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 52.27%. Comparing base (7d52dbc) to head (ce63ec2).

Files with missing lines	Patch %	Lines
...velopment.class/class/ensureAuthorInitialsWith..st	0.00%	11 Missing ⚠️
...eb.package/WAImageStatus.class/instance/version.st	0.00%	5 Missing ⚠️
...ge/WAImageStatus.class/instance/renderValuesOn..st	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1529      +/-   ##
==========================================
- Coverage   52.92%   52.27%   -0.65%     
==========================================
  Files        9203     9349     +146     
  Lines       76814    77760     +946     
==========================================
- Hits        40652    40648       -4     
- Misses      36162    37112     +950     

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