ci: set squash merge for dependabot

[NguyenHoangSon96]

Closes #

Proposed Changes

• Set the squash merge flag for dependabot.

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• A test has been added if appropriate
• mvn test completes successfully
• Commit messages are conventional
• Sign CLA (if not already signed)

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.86%. Comparing base (3ec67f4) to head (e151bfc).
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Additional details and impacted files

@@             Coverage Diff              @@
##             master     #868      +/-   ##
============================================
+ Coverage     88.83%   88.86%   +0.02%     
- Complexity      778      789      +11     
============================================
  Files           174      174              
  Lines          7282     7282              
  Branches        421      421              
============================================
+ Hits           6469     6471       +2     
+ Misses          681      679       -2     
  Partials        132      132              

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