chore: Bump Spoon version to 8.4.0-beta-5

[slarse]

We need a fix I introduced in beta-5 (INRIA/spoon#3702) to do the PR for RSP server (see #226)

[codecov]

Codecov Report

Merging #238 (5368c3e) into master (03bbeef) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #238   +/-   ##
=========================================
  Coverage     83.94%   83.94%           
  Complexity      382      382           
=========================================
  Files            41       41           
  Lines          1439     1439           
  Branches        201      201           
=========================================
  Hits           1208     1208           
  Misses          137      137           
  Partials         94       94           

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