Increased cache size limit for search_variable

This saves about 37 seconds (2m 55.07 -> 2m 18.07) in my test project of ~600 files.

Author: Lakitna

packages/robot/src/robotcode/robot/utils/variables.py

@@ -215,7 +215,7 @@ def is_variable(string: str, identifiers: str = "$@&") -> bool:
     return cast(bool, robot_is_variable(string, identifiers))
 
 
-@functools.lru_cache(maxsize=1024)
+@functools.lru_cache(maxsize=100_000)
 def search_variable(
     string: str, identifiers: str = "$@&%*", parse_type: bool = False, ignore_errors: bool = False
 ) -> VariableMatcher: