fix: move pandas to test dependency (not required by core package)

Author: statmlben

pyproject.toml

@@ -15,8 +15,7 @@ requires-python = ">= 3.10"
 dependencies = [
     "numpy >= 1.23.5",
     "scipy >= 1.11.4",
-    "scikit-learn >= 1.2.2",
-    "pandas >= 1.5.0"
+    "scikit-learn >= 1.2.2"
 ]
 
 [pyproject.urls]
@@ -32,7 +31,7 @@ py-modules = ["build"]
 build = "cp*"
 
 [project.optional-dependencies]
-test = ["pytest >= 7.0"]
+test = ["pytest >= 7.0", "pandas >= 1.5.0"]
 
 [tool.pytest.ini_options]
 testpaths = ["tests"]