Set required_ruby_version in all gemspecs

[jmthomas]

There is a warning when you create gems:

WARNING:  make sure you specify the oldest ruby version constraint (like ">= 3.0") that you want your gem to support by setting the `required_ruby_version` gemspec attribute

So this adds s.required_ruby_version = '>= 3.0' to all the gemspecs

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.89%. Comparing base (cf53094) to head (f57113f).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2351   +/-   ##
=======================================
  Coverage   79.89%   79.89%           
=======================================
  Files         654      654           
  Lines       48750    48750           
  Branches      741      741           
=======================================
+ Hits        38948    38950    +2     
+ Misses       9720     9718    -2     
  Partials       82       82           

Flag	Coverage Δ
python	82.91% <ø> (+0.01%)	⬆️
ruby-api	84.82% <ø> (-0.03%)	⬇️
ruby-backend	82.72% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud