INRIA / spoon / #18537

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fix: use expression lambdas for single-statement block lambdas (#6872)

In the scope of checkstyle/checkstyle#20692

Expression lambdas are preferred over single-line block lambdas for
readability and conciseness (as recommended by the OpenJDK Java Style
Guidelines).

Changes 2 single-statement block lambdas like:
  s -> { return s; }
to:
  s -> s

Co-authored-by: Carbon14-48 <Carbon14-48@users.noreply.github.com>

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