Add parentheses around lambda parameters

[fthomas]

This is in preparation for compiling with Scala 3.

See https://docs.scala-lang.org/scala3/guides/migration/incompat-syntactic.html#parentheses-around-lambda-parameter

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.73%. Comparing base (0844668) to head (6a2bd31).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3518   +/-   ##
=======================================
  Coverage   89.73%   89.73%           
=======================================
  Files         171      171           
  Lines        3536     3536           
  Branches      321      321           
=======================================
  Hits         3173     3173           
  Misses        363      363           

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