[backend] Upgrading to latest spring boot version

[Dimfacion]

Proposed changes

• Upgrading to latest spring boot version
• Upgrading flyway

Related issues

• Closes [security] Upgrade spring-boot-starter-parent #1770
• Closes [security] Upgrade org.flywaydb #1773

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality

Further comments

Do bear in mind that this PR deactivate schema validation. This is due to a bug as can be seen here : vladmihalcea/hypersistence-utils#697

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 33.33%. Comparing base (08eedad) to head (695d836).

Additional details and impacted files

@@                 Coverage Diff                  @@
##             release/1.10.0    #1894      +/-   ##
====================================================
- Coverage             33.61%   33.33%   -0.28%     
+ Complexity             1683     1284     -399     
====================================================
  Files                   573      517      -56     
  Lines                 16752    15594    -1158     
  Branches                976      968       -8     
====================================================
- Hits                   5631     5199     -432     
+ Misses                10866    10146     -720     
+ Partials                255      249       -6     

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