Update Gradle and dependencies / Convert to Kotlin DSL / Introduce Spotless

[bwaldvogel]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 95.23810% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.43%. Comparing base (42b2044) to head (4ecd761).

Files with missing lines	Patch %	Lines
...stgres/diff/PostgresEnumTypeSnapshotGenerator.java	80.00%	3 Missing and 2 partials ⚠️
...ase/ext/postgres/ModifyPostgresEnumTypeChange.java	95.34%	2 Missing ⚠️
...ibase/ext/postgres/AbstractPostgresEnumChange.java	50.00%	0 Missing and 1 partial ⚠️
.../liquibase/ext/postgres/diff/PostgresEnumType.java	88.88%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main       #3      +/-   ##
============================================
- Coverage     95.45%   95.43%   -0.03%     
- Complexity       85       86       +1     
============================================
  Files            13       13              
  Lines           198      197       -1     
  Branches          4        4              
============================================
- Hits            189      188       -1     
  Misses            6        6              
  Partials          3        3              

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

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.