PERF: get_requirement() raise cache from 2048 to 8192 elements

small performance improvements when installing hundreds of packages.

Author: rmmancom

src/pip/_internal/utils/packaging.py

@@ -35,7 +35,7 @@ def check_requires_python(
     return python_version in requires_python_specifier
 
 
-@functools.lru_cache(maxsize=2048)
+@functools.lru_cache(maxsize=10000)
 def get_requirement(req_string: str) -> Requirement:
     """Construct a packaging.Requirement object with caching"""
     # Parsing requirement strings is expensive, and is also expected to happen