Add spring-boot-starter dependency to pom.xml

[tschuehly]

This commit introduces the spring-boot-starter dependency to both jte-spring-boot-starter-2/pom.xml and jte-spring-boot-starter-3/pom.xml. This inclusion ensures that the necessary Spring Boot components are available for these projects, facilitating easier configuration and setup.

closes #386

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.33%. Comparing base (b097448) to head (f6763f2).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #388   +/-   ##
=========================================
  Coverage     91.33%   91.33%           
  Complexity     1215     1215           
=========================================
  Files            76       76           
  Lines          3161     3161           
  Branches        489      489           
=========================================
  Hits           2887     2887           
  Misses          164      164           
  Partials        110      110           

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