chore: update license year

[paul58914080]

Checklist for self review:

• My code follows the contribution guidelines of this project
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• My commits follow conventional commit message guidelines

[Copilot]

Pull request overview

This pull request updates copyright year information in license headers from 2023 to 2026 across the codebase. The changes are routine maintenance to keep copyright notices current.

Changes:

• Updated copyright year from 2023 to 2026 in all license headers
• Removed trailing whitespace from blank comment lines in license headers
• Removed extraneous empty lines at the beginning of two files

Reviewed changes

Copilot reviewed 108 out of 108 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
ff4j-spring-services (test files)	Updated copyright year in test Kotlin files
ff4j-spring-services (main files)	Updated copyright year in main Kotlin source files
ff4j-spring-rest-api (test/main files)	Updated copyright year in REST API Kotlin files and test resources
ff4j-spring-boot-autoconfigure-webmvc	Updated copyright year in Spring Boot WebMVC autoconfigure files
ff4j-spring-boot-autoconfigure-webflux	Updated copyright year in Spring Boot WebFlux autoconfigure files
ff4j-spring-boot-autoconfigure-common	Updated copyright year in Spring Boot common autoconfigure files

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.17%. Comparing base (83dfcd7) to head (647a762).
⚠️ Report is 105 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #588      +/-   ##
============================================
+ Coverage     87.69%   88.17%   +0.48%     
- Complexity      188      204      +16     
============================================
  Files            51       51              
  Lines           520      516       -4     
  Branches         21       21              
============================================
- Hits            456      455       -1     
+ Misses           53       50       -3     
  Partials         11       11              

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