Revert "Add lower bound for pandas-stubs"

This reverts commit bbf40ff.

Author: hamdanal

stubs/geopandas/METADATA.toml

@@ -1,6 +1,6 @@
 version = "1.1.1"
 # Requires a version of numpy with a `py.typed` file
-requires = ["numpy>=1.20", "pandas-stubs>=2.1.4", "types-shapely", "pyproj"]
+requires = ["numpy>=1.20", "pandas-stubs", "types-shapely", "pyproj"]
 upstream_repository = "https://github.com/geopandas/geopandas"
 
 [tool.stubtest]