chore: update spring-boot to 3.3.4

[vaadin-bot]

matching with flow 24.5-SNAPSHOT.
Update spring-boot to 3.3.4

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.53%. Comparing base (224b9ae) to head (8cf501d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2561   +/-   ##
=======================================
  Coverage   94.53%   94.53%           
=======================================
  Files          81       81           
  Lines        2635     2635           
  Branches      681      664   -17     
=======================================
  Hits         2491     2491           
  Misses        140      140           
  Partials        4        4           

Flag	Coverage Δ
unittests	94.53% <ø> (ø)

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[sonarcloud]

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 SonarCloud

[sonarcloud]

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 SonarCloud