chore: update dependabot configuration to increase PR limits and add cooldowns

[MohamadJaara]

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PR Submission Checklist for internal contributors

• The PR Title

  • conforms to the style of semantic commits messages¹ supported in Wire's Github Workflow²
  • contains a reference JIRA issue number like SQPIT-764
  • answers the question: If merged, this PR will: ... ³

• The PR Description

  • is free of optional paragraphs and you have filled the relevant parts to the best of your ability

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What's new in this PR?

Issues

increase the limit of open PRs for dependencies to 5 and 2 for actions
add 1 week cooldown for dependencies.

[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

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 49.78%. Comparing base (57ae24f) to head (234c01a).
⚠️ Report is 8 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #4701      +/-   ##
===========================================
- Coverage    49.79%   49.78%   -0.01%     
===========================================
  Files          600      600              
  Lines        20580    20581       +1     
  Branches      3282     3282              
===========================================
  Hits         10247    10247              
- Misses        9364     9365       +1     
  Partials       969      969              

see 1 file with indirect coverage changes

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