Fixed category of ConcreteHole production and regenerated Rascal parser

[rodinaarssen]

Semantic highlighting of metavariables in concrete patterns was not working due to an incorrect category in the Rascal grammar. This PR contains a fix and a regenerated Rascal parser (the bootstrap did not change the AST).

Fixes #2191.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46%. Comparing base (44c357a) to head (e400032).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##              main   #2201   +/-   ##
=======================================
  Coverage       46%     46%           
- Complexity    6213    6216    +3     
=======================================
  Files          758     758           
  Lines        63070   63070           
  Branches      9419    9419           
=======================================
+ Hits         29554   29565   +11     
+ Misses       31319   31303   -16     
- Partials      2197    2202    +5     

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