Fixes #19773 - Add a needs:review label to the automatic String Sync PRs

[st3fan]

Fixes #19773

This PR is a small update to the sync-strings.yml workflow that asks the create-pull-request action to set the needs:review label to the generated PRs.

[codecov-commenter]

Codecov Report

Merging #19774 (d1b6a8d) into master (13f9a35) will increase coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master   #19774   +/-   ##
=========================================
  Coverage     35.39%   35.40%           
  Complexity     1649     1649           
=========================================
  Files           545      545           
  Lines         22097    22097           
  Branches       3280     3280           
=========================================
+ Hits           7822     7823    +1     
  Misses        13371    13371           
+ Partials        904      903    -1     

Impacted Files	Coverage Δ
...rg/mozilla/fenix/settings/account/AccountUiView.kt	36.58% <0.00%> (+2.43%)	⬆️

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